A 4.534 g sample of a solid mixture was analyzed for barium ion. First the rock was crushed in a mortar and pestle. 100% of the sample was transferred to a beaker, where it was dissolved in 150.0 mL of d.i. water. to give 152 mL of solution. The aqueous sample was then analyzed by adding a small excess of sulfuric acid. The resultant reaction produced a precipitate of barium sulfate, which was collected by filtration, rinsed, dried and weighed. If 0.5376 g of barium sulfate was obtained, what was the mass percent of barium in the original sample? What was the molar concentration barium in the 152 mL of solution prior to adding sulfuric acid? Show work clearly; include a balanced net ionic chemical equation, units and sig. figs.
Answers
Answer:
6.976%
0.0152 M
Explanation:
Step 1: Write the balanced chemical equation
Ba²⁺(aq) + H₂SO₄(aq) ⇒ BaSO₄(s) + 2 H⁺(aq)
The balanced net ionic chemical equation is:
Ba²⁺(aq) + SO₄²⁻(aq) ⇒ BaSO₄(s)
Step 2: Calculate the moles corresponding to 0.5376 g of BaSO₄
The molar mass of BaSO₄ is 233.39 g/mol.
0.5376 g × (1 mol/233.39 g) = 2.303 × 10⁻³ mol
Step 3: Calculate the moles of Ba²⁺ that produced 2.303 × 10⁻³ moles of BaSO₄
The molar ratio of Ba²⁺ to BaSO₄ is 1:1. The moles of Ba²⁺ are 1/1 × 2.303 × 10⁻³ mol = 2.303 × 10⁻³ mol.
Step 4: Calculate the mass corresponding to 2.303 × 10⁻³ moles of Ba²⁺
The molar mass of Ba²⁺ is 137.33 g/mol.
2.303 × 10⁻³ mol × 137.33 g/mol = 0.3163 g
Step 5: Calculate the mass percent of barium in the original sample
0.3163 g of barium ion were in a 4.534 g-sample. The mass percent of barium ion is:
0.3163 g/4.534 g × 100% = 6.976%
Step 6: Calculate the molar concentration barium in the 152 mL of solution
2.303 × 10⁻³ moles of barium ion were in 152 mL (0.152 L) of solution. The molarity of barium ion is:
M = 2.303 × 10⁻³ mol/0.152 L = 0.0152 M
Related Questions
The diagram shows four different locations in an atom.
2
Nucleus
3
7
4
Which locations are likely to have subatomic particles with the LEAST mass? (3 points)
a
1 and 2
b
2 and 3
с
1 and 4
Od
3 and 4
Answers
The locations with subatomic particles with the least mass are locations 1 and 4.
An atom is usually divided into two main regions:
The nucleus: This is shown in the diagram with the numbers 2 and 3, and contains protons and neutrons.The outer region: This region includes everything outside the nucleus, and in this region, it is expected to find electrons.The three sub-particles previously mentioned (neutrons, protons, and electrons) differ not only in their location but also in their mass. Indeed, electrons have a lower mass if compared to neutrons and protons.
Based on this, the outer region (locations 1 and 4) has sub particles with the least mass.
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Answer:
1 and 4
Explanation:
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How many molecules in each sample?
64.7 g N2
83 g CCl4
19 g C6H12O6
Answers
Answer:
1.39x10²⁴ molecules N₂.25x10²³ molecules CCl₄6.38x10²² molecules C₆H₁₂O₆Explanation:
First we convert the given masses into moles, using the compounds' respective molar mass:
64.7 g N₂ ÷ 28 g/mol = 2.31 mol N₂83 g CCl₄ ÷ 153.82 g/mol = 0.540 mol CCl₄19 g C₆H₁₂O₆ ÷ 180 g/mol = 0.106 mol C₆H₁₂O₆Then we multiply each amount by Avogadro's number, to calculate the number of molecules:
2.31 mol N₂ * 6.023x10²³ molecules/mol = 1.39x10²⁴ molecules0.540 mol CCl₄ * 6.023x10²³ molecules/mol = 3.25x10²³ molecules0.106 mol C₆H₁₂O₆ * 6.023x10²³ molecules/mol = 6.38x10²² moleculesStereoisomers share the same connectivity and differ only in the way their atoms are arranged in space. Draw the structure of a compound that is a stereoisomer of trans-1,2-dimethylcyclopropane.
Answers
Answer:
The stereoisomer of trans-1,2-dimethylcyclopropane.
Explanation:
Stereoisomers share the same connectivity and differ only in the way their atoms are arranged in space.
The stereoisomer of trans-1,2-dimethylcyclopropane is cis-1,2-dimethylcyclopropane.
The structure of both the isomers is shown below:
4) What is/are the product(s) of the following acid-base mechanism? (2 points)
CH30 Na
CH3OH
Na e
+ CH3OH
a)
O
+ CH3OH
b)
Answers
The structures represented by A in the image are the products of the acid base reaction shown.
In organic chemistry, an important aspect of study is reaction mechanisms. Reaction mechanisms often involve movement of electrons shown as arrows. We must diligently follow the movement of these arrows in order to get the products of the reaction correctly.
If we follow the arrows in this case, we will discover that the methoxide ion picks up the proton as shown and there is a movement of electrons from the carbon bearing the 0-H group to the adjacent carbon atom. While a double bond is formed between carbon and oxygen.
These electron movements yield the products shown in (a) in the image attached to the question.
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An __________ includes all living and non-living things in an environment.
Answers
Answer:
an ecosystem
Explanation:
it compromises of living and non living things in an environment.
Consider separate solutions of NaOH and KClmade by dissolving 100.0 g of each solute in 250.0 mL of solution. Calculate the concentration of each solution in units of molarity.
Answers
Answer:
Explanation:
MW of NaOH = 40 g/mol
MW of KCl = 74.55 g/mp;
250 mL = .25 L
100g NaOH / 40 g = 25 mol
100g KCl/ 74.55g = 1.34 mol
Molarity of NaOH: 25/.25 = 100M
Molarity of KCl: 1.34/.25 = 5.36 M
100M is the concentration of NaOH.
5.36 M is the concentration of KCl.
Define the molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.
The scientific noun molarity describes the concentration of a substance as measured by the number of moles divided by the volume of the solution in litres.
\(Molality = \frac{Moles \;solute}{Volume\; of \;the \;solution \;in \;litres}\)
Molecular weight of NaOH = 40 g/mol
Molecular weight of KCl = 74.55 g/mp;
250 mL = .25 L
100g NaOH ÷ 40 g = 25 mol
100g KCl ÷ 74.55g = 1.34 mol
Molarity of NaOH: 25 ÷ .25 = 100M
Molarity of KCl: 1.34 ÷ .25 = 5.36 M
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The molar mass of Si is 28.09 g/mol.
How many atoms are in 112 g of Si?
Answers
Answer: 2.40 X10^24
Explanation: Utilizing Avogadro's Number of 6.022 X 10^23
112gSi X 1molSi/28.09gSi X 6.022 X 10^23/1molSi = 2.40 X 10^23
5. Students perform a chemical reaction in
a glass test tube. They notice that the test
tube feels cooler than it did before the
reactants were added.
b) What data could the students collect to
confirm the type of reaction?
c) Identify the system and the surroundings
in this investigation.
Answers
The data the students could collect to confirm the type of reaction is the temperature before and after the reaction.
The system is the reaction vessel and the surroundings are the laboratory environment.
What are chemical reactions?Chemical reactions are reactions in which new substances called products are formed from one or more substances that undergo chemical change called reactants.
During a chemical reaction, heat changes occur as the reactants form products. The heat changes that occur may involve the release of heat by the chemical system to the surroundings or the absorption of heat from the surrounding by the chemical system.
A reaction in which heat is absorbed will feel cold to touch and is called an endothermic reaction.
A reaction in which heat is released to the surroundings will feel hot to touch and is called an exothermic reaction.
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Convert each of the following. Quesitions by using Dimensional approach a. 350g-kg b.0.4gl-me
Answers
A standard unit is a unit that can be used everywhere as a basic unit of measurement.
350g = 0.350 kg =3.5 x \(10^{-2}\) kg
0.4 gl = 1514.16 ml = 1.5 x \(10^{3}\) ml
What are standard and non standard measurement units?Inches, pounds, and pints are examples of standard units of measurement. Steps, hand spans, cubes, counters, and sweets are examples of non-standard units of measurement.
A standard unit is a unit that can be used everywhere as a basic unit of measurement.
The SI is a coherent system of measurement that begins with seven base units: the second (symbol s, the unit of time), the metre (m, length), the kilogram (kg, mass), the ampere (A, electric current), the kelvin (K, thermodynamic temperature), the mole (mol, substance amount), and the candela (cd, luminous intensity).
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the amount of each type of ion in ionic compound is determined by?
Answers
The amount of each type of ion in an ionic compound is determined by the principle of electroneutrality.
In an ionic compound, the cation (positively charged ion) and anion (negatively charged ion) are held together by electrostatic attraction. To achieve electroneutrality in the compound, the number of cations and anions must be equal, such that the positive charges of the cations balance the negative charges of the anions.
For example, in the ionic compound sodium chloride (NaCl), the sodium ion (Na+) has a single positive charge and the chloride ion (Cl-) has a single negative charge. To achieve electroneutrality, the number of sodium ions and chloride ions must be equal in the compound. Therefore, one sodium ion combines with one chloride ion to form one molecule of NaCl.
Similarly, in calcium chloride (CaCl2), the calcium ion (Ca2+) has a double positive charge, and the chloride ion (Cl-) has a single negative charge. To achieve electroneutrality, two chloride ions are required for each calcium ion. Therefore, one calcium ion combines with two chloride ions to form one molecule of CaCl2.
In summary, the amount of each type of ion in an ionic compound is determined by the principle of electroneutrality, which requires that the number of cations and anions must be equal in the compound to achieve a neutral charge.
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Match each tern with its definition by writing the letter of the correct definition on
the line beside tite term.
Answers
Answer:
3. d
4. c
5. i
6. h
7. a
8. g
9. j
10. b
11. e
12. f
Explanation:
How does a straight-chain alkane that has five carbon atoms differ from a cycloalkane that has five carbon atoms?
Answers
Answer:
A straight-chain alkane that has five carbon atoms, also known as pentane, differs from a cycloalkane that has five carbon atoms, also known as cyclopentane, in terms of their molecular structure and properties. Pentane has a linear, straight-chain structure, while cyclopentane has a ring-shaped structure. This difference in structure affects their physical and chemical properties. For example, pentane has a higher boiling point and lower melting point than cyclopentane due to the differences in the strength of the intermolecular forces between their molecules
Explanation:
Malachite green elutes faster from the column than crystal violet so malachite green is the _________ dye.
Answers
Answer:
Malachite green is prepared by the condensation of benzaldehyde and dimethylaniline to give leuco malachite green (LMG): Second, this colorless leuco compound, a relative of triphenylmethane, is oxidized to the cation that is MG: C6H5CH(C6H4N(CH3)2)2 + HCl + 1⁄2 O2 → [C6H5C(C6H4N(CH3)2)2]Cl + H2O.
Explanation:
What is the pH of a 50.0 mL solution of a 0.250 M HC2H3O2 solution after the
addition of 50 mL of 0.250 M NaOH to it? The Ka value for HC2H3O2 is 1.8 x 10-5
.
Answers
A 50.0 mL solution of 0.250 M HC₂H₃O₂ before and after adding 50 mL of 0.250 M NaOH has a pH of 2.87, the pH changes due to the formation of a buffer solution, which can be calculated using the Henderson-Hasselbalch equation.
How to calculate pH of the solution?This problem requires us to calculate the pH of a buffer solution after the addition of a strong base. A buffer solution is one that resists pH changes when modest amounts of acid or base are added. The buffer system in this case is the weak acid, acetic acid (HC₂H₃O₂) and its conjugate base, acetate ion (C₂H₃O₂-).
Before the addition of NaOH, we have a solution of 0.250 M HC₂H₃O₂, which we can assume to be completely dissociated in water:
HC₂H₃O₂ + H₂O ⇌ H₃O+ + C₂H₃O₂-
HC₂H₃O₂ has a Ka value of 1.8 x 10-5. We can use this Ka value to calculate the equilibrium concentration of H3O+ and C₂H₃O₂- in the solution.
First, we need to calculate the initial concentrations of HC₂H₃O₂ and C₂H₃O₂-.
moles of HC₂H₃O₂ = 0.250 M × 0.0500 L = 0.0125 mol
moles of C₂H₃O₂- = 0 mol (since there is no NaOH added yet)
Since HC₂H₃O₂ is a weak acid, it only partially dissociates in water. The equilibrium concentrations of H₃O+ and C₂H₃O₂- can be calculated using the Ka expression:
Ka = [H₃O+][C₂H₃O₂-]/[HC₂H₃O₂]
We can assume that the initial concentration of H3O+ is negligible compared to the amount that will be produced by the dissociation of HC₂H₃O₂, so we can simplify the expression to:
Ka = [H₃O+]²/[HC₂H₃O₂]
[H₃O+]² = Ka × [HC₂H₃O₂]
[H₃O+]² = 1.8 × 10⁻⁵ × 0.0125
[H₃O+] = 1.34 × 10⁻³ M
Now that we know the equilibrium concentration of H₃O+, we can use the pH formula to calculate the pH:
pH = -log[H₃O+]
pH = -log(1.34 × 10⁻³)
pH = 2.87
This is the pH of the buffer solution before the addition of NaOH.
Next, we add 50 mL of 0.250 M NaOH to the solution. NaOH is a strong base, so it completely dissociates in water to produce OH- ions:
NaOH → Na+ + OH-
The OH- ions will react with the acetate ions in the buffer solution to form water and acetate ions:
OH- + C₂H₃O₂- → H₂O + C₂H₃O₂-
This reaction will consume some of the acetate ions in the buffer solution, causing the equilibrium to shift to the left to produce more acetate ions.
To calculate the new concentrations of H₃O+ and C₂H₃O₂-, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])
where pKa = -log(Ka), [C₂H₃O₂-] is the equilibrium concentration of acetate ions, and [HC₂H₃O₂] is the equilibrium concentration of acetic acid.
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Stephan’s mother cuts a twig from a rose bush and plants it in the soil. After a few days, Stephan observes a new plant growing. Which characteristic does the growth of the new plant depict?
Answers
The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.
Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.
The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.
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Use the ball and stick models above. If you had a gram of water and a gram of
oxygen, which substance would you have more particles of? Why? (Right or Wrong)
Answers
Answer:
When the weather is nice, many people begin to work on their yards and homes. For many projects, sand is needed as a foundation for a walk or to add to other materials. You could order up twenty million grains of sand and have people really stare at you. You could order by the pound, but that takes a lot of time weighing out. The best bet is to order by the yard, meaning a cubic yard. The loader can easily scoop up what you need and put it directly in your truck.
Avogadro’s Number
It certainly is easy to count bananas or to count elephants (as long as you stay out of their way). However, you would be counting grains of sugar from your sugar canister for a long, long time. Atoms and molecules are extremely small – far, far smaller than grains of sugar. Counting atoms or molecules is not only unwise, it is absolutely impossible. One drop of water contains about 10 22 molecules of water. If you counted 10 molecules every second for 50 years without stopping you would have counted only 1.6 × 10 10 molecules. Put another way, at that counting rate, it would take you over 30 trillion years to count the water molecules in one tiny drop.
Explanation:
According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale). If this is true, what determines the difference between a slate and a gneiss rock that both are formed from shale? What role does the parent rock play in determining the type of metamorphic rock that will be formed?
Answers
According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale) is a true statement.
The parent rock, in this case shale, plays a significant role in determining the type of metamorphic rock that will be formed. The minerals and structure of the parent rock provide the starting material for the metamorphic rock, and the specific conditions under which the rock undergoes metamorphism determine the final characteristics of the metamorphic rock.What determines the difference between a slate and a gneiss rock that both are formed from shale?Slate, phyllite, schist, and gneiss are all types of metamorphic rocks that can be formed from shale, which is a sedimentary rock composed of clay and other fine-grained minerals. The specific type of metamorphic rock that is formed from shale depends on the conditions under which the shale undergoes metamorphism, including the temperature, pressure, and presence of fluids.
Slate is a fine-grained metamorphic rock with a uniform, flat surface and a layered structure. It is formed when shale undergoes low-grade metamorphism, which occurs at relatively low temperatures and pressures.
Therefore, Gneiss, on the other hand, is a medium- to coarse-grained metamorphic rock with a banded or wavy texture. It is formed when shale undergoes high-grade metamorphism, which occurs at higher temperatures and pressures.
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List two characteristics of a calorimeter that are necessary for successful heat measurement.
Answers
Two characteristics of a calorimeter that are necessary for successful heat measurement are good thermal insulation to minimize heat loss and a temperature measurement device to accurately measure temperature changes.
How does a calorimeter work?A calorimeter works by measuring the heat exchanged between two substances in a chemical or physical process. The substances are placed in the calorimeter and allowed to reach thermal equilibrium, and the temperature change of the system is measured to calculate the amount of heat transferred.
What is the difference between a bomb calorimeter and a coffee cup calorimeter?A bomb calorimeter is designed for measuring the heat of combustion of a substance in a sealed container under constant volume conditions, while a coffee cup calorimeter is a simpler design used for measuring the heat of reaction of a substance in an open container under constant pressure conditions. The bomb calorimeter is typically more accurate but also more complex and expensive to use.
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How many grams of P2O5 are formed from 3.4 moles of O2? SHOW the math below
Answers
Answer:
I will do it again soon to open the door to my house with a new year sa imo lang mam kay I have a great time to go to work for the last time
The mass of the P₂O₅ formed from 3.4 moles of O₂ gas is equal to 386.1 g.
What is a mole?A mole can be described as a unit for measurement of a huge number of quantities of atoms, molecules, ions, or other particles. The atomic mass can be expressed as the one mole of any element.
The number of particles present in one mole was to be equal to 6.023 × 10 ²³ which is Avogadro’s constant.
Given, the number of moles of O₂ gas = 3.4 moles
The balanced chemical reaction of phosphorous and oxygen gas can be given as:
4 P + 5 O₂ → 2 P₂O₅
5 mol of Oxygen reacts with moles of P₂O₅ = 2 mol
3.4 mol of O₂ gas reacts with moles of P₂O₅ = (2/5) × 3.4 = 1.36 mol
The mass of the 1.36 mol of P₂O₅ = 1.36 × 283.89 = 386.1 g
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Why do some hockey players go flying when they are checked?
Answers
1) To increase the amount of NH3 at 200 atm, the manufacturer should (increase, decrease, not change) the temperature of the reaction chamber.
2) This change in temperature would shift the reaction to the (left, right) because this equilibrium reaction is (exothermic, endothermic)
Answers
The temperature of the reaction should be decreased
This change in temperature would make the equilibrium to shift to the right.
What is the LeChatelier principle?
The Le Chatelier's principle, commonly referred to as the Le Chatelier's principle of equilibrium, is a chemical principle that describes how an equilibrium system reacts to environmental changes.
According to this theory, when an equilibrium system is exposed to an outside force, it will respond in a way that partially offsets the imposed change and restore equilibrium.
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Chemistry Help (Naming Oxyacids Chart)
Answers
Answer:
HClO₃ /chloric acid /suffix -ic/ ClO₃⁻ (chlorate)
HClO₂/ chlorous acid/ suffix -ous/ ClO₂⁻ (chlorite)
HNO₃ /nitric acid /suffix -ic/ NO₃⁻ (nitrate)
HNO₂/ nitrous acid/ suffix -ous/ NO₂⁻ (nitrite)
Explanation:
Chlorine has 4 positive oxidation numbers to form oxyacids: +1, +3, +5 and +7.
When it uses the oxidation number +5, it forms HClO₃, which is named chloric acid, with the suffix -ic. When it loses an H⁺, it forms the oxyanion ClO₃⁻ (chlorate).When it uses the oxidation number +3, it forms HClO₂, which is named chlorous acid, with the suffix -ous. When it loses an H⁺, it forms the oxyanion ClO₂⁻ (chlorite).Nitrogen has 2 positive oxidation numbers to form oxyacids: +3 and +5.
When it uses the oxidation number +5, it forms HNO₃, which is named nitric acid, with the suffix -ic. When it loses an H⁺, it forms the oxyanion NO₃⁻ (nitrate).When it uses the oxidation number +3, it forms HNO₂, which is named nitrous acid, with the suffix -ous. When it loses an H⁺, it forms the oxyanion NO₂⁻ (nitrite).The formula relating mass and weight is W=
Answers
Answer:
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg.
Explanation:
W=F=M x GThe measurement of the effect of gravity on an object's mass is called weight. While mass m is a measurement of the object's amount of matter. W=mg provides the weight.
What is the formula relating to mass and weight?The formula W (weight) = m (mass) times g (gravity, on Earth typically measured at 9.8 N/kg) allows you to determine something's weight from its mass and vice versa.
The common weight calculation formula is W = mg (N/kg). Here, "g" stands for the acceleration brought on by gravity. The value of g on earth is 9.8 m/s2. Other names for it include the gravitational constant.
A body's mass, which is a measurement of how much matter it contains, is equal to its weight when multiplied by the acceleration caused by gravity. The SI unit of weight is the Newton, and the SI unit of mass is the kilogramme (kg) (N).
Thus,The formula relating mass and weight is W=mg.
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How many covalent bonds must each carbon atom have around it in an organic or biochemical molecule? 1 2 3 4
Answers
Answer:
4 covalent bonds
Explanation:
Each carbon atom can form as many as four covalent bonds with other carbon atoms as well as with other elements. Be able to explain why this is so. Be able to list the four main groups of organic molecules and their functions in living things.
A reservoir is filled with 4 billion cubic feet of polluted water that initially contains 0.4% pollutant. Every day 400 million cubic feet of pure water enters the reservoir and the well-mixed solution flows out at the same rate. When will the pollutant concentration in the lake be reduced to 0.2%
Answers
Answer:
Thus, the pollutant concentration in lake will be reduced to 0.2% after 6.931471 days
Explanation:
From the information given:
A(t) = amount of pollutant for time (t)
A 4 billion cubic ft is the same as 4000 million cubic ft:
∴
The Initial amount of pollutant is \(A_o = (\dfrac{0.4}{100})\times 4000\)
\(A_o = 16 \ million \ cubic \ feet\)
However;
the pollutant rate (input) = 400 × 0 = 0
the pollutant rate (output) = \(400( \dfrac{A(t)} {4000})\)
\(= 1( \dfrac{A(t)} {10})\)
The net rate = \(A'(t) = 0 - 1( \dfrac{A(t)} {10})\)
\(\implies A'(t) = - 1( \dfrac{A(t)} {10})\)
\(\implies \dfrac{1}{A(t)}A'(t) = -(\dfrac{1}{10})\)
\(\implies \int (\dfrac{1}{A(t)}A'(t) ) dt = \int -(\dfrac{1}{10}) dt\)
\(\implies In (A(t)) = -(\dfrac{1}{10})t + c\)
\(\implies A(t) = e^{-(\dfrac{1}{10})t+c}\)
\(\implies A(t) = Ce^{-\dfrac{1}{10}^t}\)
A(0) = 16
\(\implies Ce^{ -(1/20)^0} = 16 \\ \\ C = 16\)
\(\implies A(t) = 16e^{(-1/10)t}\)
\(0.2\% \ pollutant = (\dfrac{0.2}{100})*4000 =8 \ million \ cubic \ feet\)
A(t) = 8
\(\implies 16e^{(-1/10)t}= 8 \\ \\ \implies e^{1/10)t} = 2 \\ \\ (\dfrac{1}{10} )^t = In(2) \\ \\ t = 10\ In(2) \\ \\ \mathbf{ t = 6.931471}\)
what is the volume of 18.9 g of a liquid that has a density of 0.956 g/ml
Answers
To get volume you divide the mass by the density which gives you about
19.77 ml in volume
Which of the following happens to a molecule of an object when the object is heated? (1 point)
Answers
Answer:
They get more energy, so they vibrate!
Explanation:
What is the pH of an acetic acid solution where the concentration of acetic acid is 2 mM and the concentration of sodium acetate is 20 mM. The pKa of acetic acid is 4.76.
Answers
Answer:
pH = 5.76
Explanation:
We can solve this problem by using Henderson-Hasselbach's equation:
pH = pKa + log\(\frac{[SodiumAcetate]}{[AceticAcid]}\)
We are already know all the required information, thus we input the data given by the problem:
pH = 4.76 + log(20/2)
And finally calculate the pH:
pH = 5.76
The pH of that acetic acid solution is 5.76.
How does temperature affect Keq of a reaction
Answers
In an endothermic reaction, Keq increases as the temperature increases and vice versa.
In an exothermic reaction, Keq decreases as the temperature increases and vice versa.
Keq is the equilibrium constant of a reaction. The equilibrium constant is independent of the concentrations of the reactants and productsThe only factor that the equilibrium constant depends on is the temperature of the system of reactionIn an endothermic reaction, energy is gainedSo a higher temperature is more favourable in an endothermic reactionAs a result, more products are formed at a higher temperature, leading to a higher value of KeqIn an exothermic reaction, energy is releasedSo a lower temperature is more favourable in an exothermic reactionAs a result, fewer products are formed at a higher temperature, leading to a lower value of KeqTherefore, the temperature is the only factor that affects the equilibrium constant of a reaction.
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How many moles of water were lost if the amount of water lost was 0.369 grams? Do not include units and assume three significant figures in all numbers. Be sure to include the zero before the decimal if the number is less than one.
Answers
0.0205 moles of water were lost if the amount of water lost was 0.369 grams. The given answer is in three significant figures with including zero before the decimal.
To find the number of moles of water lost, we need to know the molar mass of water (H2O).
Molar mass is the sum of the atomic masses of all the atoms present in a molecule.
Since the molecule of water contains two atoms of hydrogen and one atom of oxygen, the molar mass of water is given by the sum of the atomic masses of two hydrogen atoms and one oxygen atom, which is: 2(1.008 g/mol) + 1(15.999 g/mol) = 18.015 g/mol
Therefore, one mole of water has a mass of 18.015 g.
The number of moles of water lost can be calculated using the following formula: Number of moles = Mass of substance / Molar mass of substance
Substituting the given values, we get: Number of moles = 0.369 g / 18.015 g/mol = 0.0205 mol
Thus, 0.0205 moles of water were lost if the amount of water lost was 0.369 grams.
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