Answers
The value of x : 2
Further explanationSemi-normal Hydrochloric acid solution = 0.5 N = 0.5 M
for titration :
M₁V₁n₁=M₂V₂n₂(1=HCl,2=Na₂CO₃)
\(\tt 0.5\times 20\times 1=M_2\times V_2\times 2\\\\M_2V_2=5~mlmol=5.10^{-3}mol\)
\(\tt MW=\dfrac{mass}{mol}=\dfrac{0.715}{5.10^{-3}}=143~g/mol\)
MW Na₂CO₃.xH₂O=143
MW Na₂CO₃.xH₂O = MW Na₂CO₃+ MW xH₂O = 143
MW Na₂CO₃ = 106 g/mol
MW xH₂O = 18x
Equation :
\(\tt 106+18x=143\\\\18x=37\\\\x=\dfrac{37}{18}=2.056\approx 2\)
Related Questions
please help me with these
Answers
1) Diesel has a higher viscosity than petrol.
2) Petrol is more flammable than diesel.
3) The formula will be C₁₀H₂₂.
4) The equation is; 2C8H18+25O2→16CO2+18H2O.
What is the hydrocarbon?Depending on the precise composition and temperature, the viscosity of gasoline and diesel can change. In general, diesel is more viscous than gasoline. Higher viscosity fluids are thicker and flow more slowly than lower viscosity fluids because viscosity relates to the resistance of a fluid to flow.
Diesel is less flammable than gasoline. The lowest temperature at which gasoline can evaporate and turn into an ignitable combination in air is known as its flash point, and it is lower for gasoline. Compared to diesel fuel, petrol vapors are much more flammable and can ignite at lower temperatures.
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Question 4Calculate the maximum mass (in g) of Pb(s) that can be obtained from the reaction of 393. g PbS with 593. g PbO. Enter your answer as an integer.2 PbO(s) + PbS(s) → 3 Pb(s) + SO₂(g)826 margin of error
Answers
1) Write the chemical equation.
\(2PbO+PbS\rightarrow3Pb+SO_2\)2) List the known and unknown quantities.
Sample: PbS
Mass: 393. g.
Sample: PbO.
Mass: 593. g.
Pb produced: unknown.
3) Convert masses to moles
3.1-Convert mass of PbS to moles of PbS.
The molar mass of PbS is 239.2650 g/mol.
\(mol\text{ }PbS=393.\text{ }g\text{ }PbS*\frac{1\text{ }mol\text{ }PbS}{239.2650\text{ }g\text{ }PbS}=1.642530\text{ }mol\text{ }PbS\)We have 1.64 mol PbS
3.2-Convert mass of PbO to moles of PbO.
The molar mass of PbO is 223.1994 g/mol.
\(mol\text{ }PbO=593.\text{ }g\text{ }PbO*\frac{1\text{ }mol\text{ }PbO}{223.1994\text{ }g\text{ }PbO}=2.656817\text{ }mol\text{ }PbO\)We have 2.66 mol PbO.
4) Limiting reactant
4.1-How many moles of PbO do we need to use all of the PbS?
The molar ratio between PbO and PbS is 2 mol PbO: 1 mol PbS.
\(mol\text{ }PbO=1.64\text{ }mol\text{ }PbS*\frac{2\text{ }mol\text{ }PbO}{1\text{ }mol\text{ }PbS}=3.28\text{ }mol\text{ }PbO\)We need 3.28 mol PbO and we have 2.66 mol PbO. We do not have enough PbO. This is the limiting reactant.
4.2-How many moles of PbS do we need to use all of the PbO?
The molar ratio between PbO and PbS is 2 mol PbO: 1 mol PbS.
\(mol\text{ }PbS=2.66\text{ }mol\text{ }PbO*\frac{1\text{ }mol\text{ }PbS}{2\text{ }mol\text{ }PbO}=1.33\text{ }mol\text{ }PbS\)We need 1.33 mol PbS and we have 1.64 mol PbS. We have enough PbS. This is the excess reactant.
5) Moles of Pb produced in the reaction from the limiting reactant.
Limiting reactant: We have 2.66 mol PbO.
The molar ratio between PbO and Pb is 2 mol PbO: 3 mol Pb.
\(mol\text{ }Pb=2.66\text{ }mol\text{ }PbO*\frac{3\text{ }mol\text{ }Pb}{2\text{ }mol\text{ }PbO}=3.99\text{ }mol\text{ }Pb\)6) Convert moles of Pb to mass of Pb.
The molar mass of Pb is 207.2000 g/mol.
\(g\text{ }Pb=3.99\text{ }mol\text{ }Pb*\frac{207.2000\text{ }g\text{ }Pb}{1\text{ }mol\text{ }Pb}=826.728\text{ }g\text{ }Pb\)The mass of Pb produced is 827. g Pb.
.
A gas is at 35.0°C and 4.50 L. What is the temperature of the gas if the volume is increased to 9.00 L?
A gas is at 35.0°C and 4.50 L. What is the temperature of the gas if the volume is increased to 9.00 L?
65.0°C
343°C
17.5°C
1.16°C
614°C
Answers
Answer: 343 Celsius
Explanation:
Gay lussac law
T2=T1V2/V1 Temp must be in Kelvin
T2= 308.15 X 9.00 / 4.50 =616.30 K - 273.15 to get back in celsius
=343.15 C
Which property describes a material's ability to conduct heat?
Answers
Thermal conductivity
Explanation)
Thermal conductivity is the ability of a material to conduct heat, and it represents the quantity of thermal energy that flows per unit time through a unit area with a temperature gradient of 1° per unit distance.
Guysss how to explain nuclear chemistry? And define nuclear chemistry ?
Answers
Answer:
How do amoeba respire.
Define Diffusion.
Which portion of a molecule of F2O has partial positive charge?
Question 3 options:
A)
The F atoms
B)
The central O atom
C)
The partial charge on each atom is zero
D)
The partial charge on each atom is negative
Answers
The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B
The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.
Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.
In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.
Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.
Option B
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Question 5 of 20:
Select the best answer for the question.
5. When considering gravity acceleration and the force of acceleration, what must be true?
O A. The direction of acceleration must be perpendicular to the direction of the force.
O B. The direction of the force and the direction of acceleration must be opposite of each other.
OC. The direction of the force and the direction of acceleration must be the same as each other.
O D. The mass of the body must be the same as the acceleration of the body.
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If a car travels 60 miles for two hours, what is the average speed?
15 mi/hr
30 mi/hr
45 mi/hr
60 mi/hr
Answers
Answer:
The average speed must be 30mph so this means the car traveled for 2hrs 60/30
Which element in period 5 has the largest atomic radil
Answers
Answer:
francium is the answer
Explanation:
It should be noted that the element in period 5 has the largest atomic radius is Francium.
What is an atomic radius?It should be noted that an atomic radius simply means the measure of the size of the atom from the center of the nucleus.
In this case, the element in period 5 has the largest atomic radius is Francium while Helium has the smallest radius.
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when molecules colide is the explosion instant or is there a delay if so why is there a delay
Answers
When molecules collide, there is generally a delay before an explosion occurs, if an explosion occurs at all. This is because an explosion requires a chemical reaction to take place, which involves the breaking of chemical bonds and the formation of new bonds. These reactions require a certain amount of energy, which is called the activation energy.
The collision of molecules can provide energy to the system, but it is not always enough to overcome the activation energy needed for a chemical reaction to occur. If the energy of the collision is less than the activation energy, no reaction will occur and there will be no explosion. If the energy of the collision is equal to or greater than the activation energy, a chemical reaction may occur and an explosion may result.
The time delay between the collision of molecules and an explosion occurring depends on the nature of the molecules and the conditions under which the collision occurs. Some chemical reactions are very fast and can occur almost instantly, while others may take longer to reach the activation energy and proceed to completion.
It's worth noting that not all collisions between molecules result in an explosion. In many cases, the collision may simply transfer energy from one molecule to another without leading to a chemical reaction.
What is the formula of the compound in which the atom combining ratios are:
chlorine : oxygen : fluorine = 1:3:1
Enter elements in the order given:
Please help me with this
Answers
Answer:
Explanation:
The formula of the compound in which the atom combining ratios are:
chlorine : oxygen : fluorine = 1:3:1 is ClO3F i.e. perchloryl fluoride.
What is Chemical formula?The chemical formula is define as a method of providing information about chemical properties of atoms that make a particular chemical compound or molecule by chemical name and symbols.
There are mainly three types of chemical formula
Empirical formula - It can be defined as a simple representation of a relative number of each type of atom or ratio of the element in the compound.Molecular formula - It is defined as an indicator of simple number of all types of atom in a molecule of a molecular substance. Condensed formula - It is defined to characterize all types and spatial arrangement of bond in a simple chemical substance.Thus, the formula of the compound in which the atom combining ratios are:
chlorine : oxygen : fluorine = 1:3:1 is ClO3F i.e. perchloryl fluoride.
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I need help I don’t understand this is hitting
Answers
Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.
Thus, They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, according to the stoichiometry of chemical reactions.
In the aforementioned reaction, 2 moles of ammonia are created when 3 moles of hydrogen gas react with 1 mole of nitrogen gas.
In most cases, this reactant dictates when the reaction will end. The reaction stoichiometry can be used to determine the precise quantity of reactant that will be required to react with another element. The limiting agent is determined by the mole ratio rather than the mass of the reactants.
Thus, Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.
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cl-+peg=hcl+peg rate law, rate constant k
Answers
a. The rate law for this reaction is: Rate = k[Cl] [H₂]. This means that the rate of the reaction is directly proportional to the concentrations of both Cl and H₂ molecules.
What is rate law?Rate law is an equation that describes the rate of a chemical reaction as a function of the concentrations of reactants. The rate law allows us to describe how the rate of a reaction changes when the concentrations of reactants are changed. It is derived from the rate equation, which is a mathematical expression that can be used to calculate the rate of a reaction from the concentrations of the reactants and the rate constant.
b. The rate law for this reaction is: Rate = k[O] [Os]. This means that the rate of the reaction is directly proportional to the concentrations of both O and Os molecules.
c. The rate law for this reaction is: Rate = k[NO₂]₂. This means that the rate of the reaction is directly proportional to the square of the concentration of NO₂ molecules.
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Complete Question:
every sperm has ____(one/two) sex chromosomes
PLEASE TELL THE ANSWER!!
Answers
Two chromosomes
Explanation:
The chromosomes are XY
Please mark me brainliest
Answer:
Two
Explanation:
Every sperm cell has two chromosomes.One is X and other is Y .They are found in pairs either XY or XXAt a certain temperature it is found that 1.83 moles of H2, 2.33 moles of 02 and 3.95 moles of H2O are in equilibrium in a 8.1 L container according to the reaction below. What is the equilibrium constant?
2 H2 (g) + 02 (g) = 2 H20 (g)
Keep extra significant figures during the calculation and round your answer to 1 decimal place.
Answers
0.6 is the equilibrium constant for the given reaction.
To calculate the equilibrium constant (K) for the given reaction, we need to use the molar concentrations of the reactants and products at equilibrium. The equilibrium constant expression is given by:
\(K= [H_{2}O]^{2} / ([H_{2}^{2} * [O_{2}])\)
Given the moles of H2, O2, and H2O in the 8.1 L container, we can convert them to molar concentrations by dividing the number of moles by the volume:
[H2] = 1.83 moles / 8.1 L
[O2] = 2.33 moles / 8.1 L
[H2O] = 3.95 moles / 8.1 L
Substituting these values into the equilibrium constant expression, we have:
K = \((3.95 / 8.1)^{2}\) / (\((1.83 / 8.1)^{2}\) * (2.33 / 8.1))
Evaluating this expression and rounding to one decimal place, we find the equilibrium constant to be:
K ≈ 0.6
Therefore, the equilibrium constant for the given reaction is approximately 0.6.
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A piece of red litmus and a piece of blue litmus are dipped into a solution of NaOH. What are the final colors of the papers? Group of answer choicesThe red stays red and the blue stays blueThe red litmus turns blue and the blue litmus turns redBoth are redBoth are blue
Answers
Answer:
Both are blue.
Explanation:
Remember that litmus indicator solution turns red in acidic solutions and blue in alkaline (basic) solutions.
In this case, NaOH is a base (specifically, a strong base). So if we dip the red litmus, it will turn blue and the blue litmus would stay blue, so the answer is that both are blue.
Displacement can be observed when
you
A. boil water on the stove.
B. place an apple on a scale.
C. measure the height of a plant.
D. jump into a pool and see the water splash.
be
Answers
Answer:
D) Water splashing
Explanation:
Displacement is about moving something from its original place. In A, B, and C nothing is being moved. This makes D the only answer!
If it requires 45.8 cal to melt 8.4 g of a substance, what is the heat of
fusion of the substance?
Answers
Answer:
5.452 cal/g
Explanation:
45.8 cal / 8.4 g = 5.4523 cal/g
384.72 J is the heat of fusion of the substance.
What is the heat of fusion?It is the change in the value of the enthalpy by providing energy i.e. heat, for a specific quantity of the substance.
Given data:
Heat of fusion =?
Mass of substance = 8.4 g
Unknown:
Amount of energy required to melt the given mass = 45.8 cal
Solution:
To solve this problem, the amount of energy required to melt the substance is given as;
H = m L
m is the mass
L is the heat of fusion
Insert the given parameters and solve;
H = 8.4 g x 45.8 cal = 384.72 J
Hence, 384.72 J is the heat of fusion of the substance.
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Consider the orbital diagram shown. Which electron rule is broken in the diagram?
A. Aufbau Principle
B. Hund's Rule
C. Pauli Exclusion Principle
Answers
According to the provided orbital diagram, Hund's Rule looks to be the electron rule that is broken. According to Hund's rule, when degenerate orbitals with equal energy are accessible, electrons will first fill them individually before doing so in pairs.
While it should have been singly occupied in a distinct 2p orbital before partnering up, the second electron in the 2p orbital in the following diagram is paired with the first electron. Therefore, B. Hund's Rule is the appropriate response.
Hund's ruleThe way electrons are inserted into subshells of an atom is determined by the quantum mechanical concept known as Hund's rule. According to this theory, electrons will first occupy each orbital individually with their spins parallel (having the same spin quantum number) before teaming up with electrons in other orbitals when many orbitals with the same energy (degenerate orbitals) are available.This means that the first electron will occupy one of the available three degenerate 2p orbitals, for instance, and the second electron will occupy a different orbital with the same spin. The electrons won't start pairing up until all three orbitals are fully occupied.learn more about Hund's rule here
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5. 1.00 mol HNO3 is treated with 4.47 g of magnesium. Calculate the number of moles of
HNO3 after all the metal has reacted. The unbalanced reaction is
HNO3 (aq) + Mg(s) + Mg(NO3)2 (aq) + H2(g)
a. 0.632 mol b. 0.184 mol c. 1.00 mol d. OM(all HNO3 used up)
Answers
Answer:
The balanced equation is:
2 HNO3 + Mg ---> Mg(NO3)2 + H2
From the equation, we can see that we need twice the moles of HNO3 than the moles of Mg
Moles of Mg:
Molar mass of Mg = 24 g/mol
Moles = Given mass / Molar Mass
Moles of Mg = 4.47 / 24 = 0.18 moles (approx)
Hence, 2(moles of Mg) = 0.36 moles of HNO3 will be consumed
Number of moles of HNO3 after the reaction is finished is the number of unreacted moles of HNO3
Unreacted moles of HNO3 = Total Moles - Moles consumed
Unreacted moles of HNO3 = 0.64 moles (approx)
Since we approximated the value of moles of Mg, the value of remaining moles of HNO3 will also be approximate
From the given options, we can see that 0.632 moles is the closest value to our answer
Therefore, 0.632 moles will remain after the reaction
Assess the following statements about fractional distillation. Determine which are TRUE/FALSE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points.
b. The column efficiency of a fractionating column can be assessed by the HETP
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component
d. A fractionating column is part of the apparatus set-up
Answers
The assessments of the given statements on the nature of the fluids and
the fractional distillation processes are as follows;
a. TRUE
b. TRUE
c. FALSE
d. A fractionating column is a glass piece that contains metal pieces or glass beads
What are the correct points regarding fractional distillation?Option a.
Multiple vaporization-condensation cycles enhances the separation of
the components of the mixture;
Thereby enabling purification of the samples that have boiling points
that are close.
Option a is therefore; TRUE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points. TRUEOption b.
The Height Equivalent to Theoretical Plate, HETP, indicates the
efficiency of the separation, and the fractionating column.
Therefore, option b. is TRUE
b. The column efficiency of a fractionating column can be assessed by HETP. TRUEOption c.
After every condensation-vaporization cycle, the condensate contains
more of the more volatile, component and the vapor be comes enriched
in the lower boiling point component.
Therefore, option c is FALSE
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component. FALSEOption d.
d. The location of a fractionating column is placed vertically between the
mixture to be separated and the 'Y' adaptor, and consist of a straight
tube containing pieces of metals or glass beads.
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How many atoms of hydrogen would need to bond with a single atom of selenium to form a molecular compound?
Answers
Answer:
Hydrogen sulfide reacts with aqueous selenous acid to produce selenium disulfide:
H2SeO3 + 2 H2S → SeS2 + 3 H2O
Selenium disulfide consists of 8-membered rings. It has an approximate composition of SeS2, with individual rings varying in composition, such as Se4S4 and Se2S6. Selenium disulfide has been used in shampoo as an antidandruff agent, an inhibitor in polymer chemistry, a glass dye, and a reducing agent in fireworks.[15]
Selenium trioxide may be synthesized by dehydrating selenic acid, H2SeO4, which is itself produced by the oxidation of selenium dioxide with hydrogen peroxide:[17]
SeO2 + H2O2 → H2SeO4
Hot, concentrated selenic acid can react with gold to form gold(III) selenate.[18]
Oxygen has 8 electrons. Is it chemically inert or reactive?
Answers
Answer:
Reactive
Explanation:
Answer:
Reactive
Explanation:
Oxygen is extremely active chemically, forming compounds with almost all of the elements except the inert gases.
If I have 2 moles of apple, how many apples do I have?
Answers
N = n*NA
N = number of particles/items
n = number of moles
NA = Avogadro’s number ≈ 6.02*10^23
Therefore:
N = (2)*(6.02*10^23)
N = 1.20*10^24 apples
Which of the following are the weakest among the intermolecular forces? (5 points)
Ion-dipole forces
Hydrogen bonding
Dipole-dipole forces
London dispersion forces
Answers
London dispersion forces are known to be the weakest among the intermolecular forces. Therefore, option (D) is correct.
What are London dispersion forces?London dispersion forces can be described as a type of intermolecular force acting between atoms and molecules that are generally electrically symmetric. The electrons are generally symmetrically distributed with respect to the nucleus and are part of the van der Waals forces.
The electron distribution around an atom undergoes varies in time which creates electric fields felt by other nearby atoms and molecules.
The net effect is in electron positions in an atom produce a corresponding redistribution of electrons in other atoms. These are the weakest among the other intermolecular forces.
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CALCULATE the no of atoms in 0.6g of Ca
Answers
How do you prepare a solution of sugar 342g/mol. 0.45 in 50ml
Answers
0.01 mol/L is the molarity of given solution. 0.002 moles is added to 0.2 L solvent to make desired solution.
The amount of moles of solute found in a specific number of litres of the solution, or moles per litre of a solution, is known as molar concentration or molarity. Solutes are simply substances that can be found in solutions because a solution is defined as a homogenous mixture that comprises one or more solutes.
molar mass =342g /mol
number of moles=mass of solute / molar mass
0.45 /342 =0.002 moles
Volume solution = 50 mL / 1000 =0.2 L
M = n / V
M = 0.002 / 0.2
M = 0.01 mol/L
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7. Write the equation for the positron emission of barium-127.
Answers
The reaction is given by
\(\\ \rm\Rrightarrow {}^{127}_{56}Ba\longrightarrow {}^{0}_{+1}\beta+{}^{127}_{55}Cs\)
Barium goes underneath beta decay to form Ceaseum
Cs is very mellable elementIt can melt on your hand\(\sf {}^{127}_{56}Ba\longrightarrow {}^0_{1}\beta+{}^{127}_{55}Cs\)
Remember
Radioactive decays are first order reactionsThe rate constant doesn't depend upon initial concentrationIt's never ending reactionwater can be made using the reversible reaction shown, which change would kee
p this reaction from shifting to form more of the product?
Answers
We can produce more products by;
A. Increasing the concentration of H₂ gas in the reaction vessel
B. Decreasing the temperature in the reaction vessel
C. Removing the H₂O from the reaction vessel as it forms
Is formation of water an exothermic reaction?
Water is created through an exothermic process. Heat energy is released when hydrogen gas (H2) and oxygen gas (O2) mix to make water (H2O). An exothermic reaction is characterized by this energy release.
The reaction's overall energy change is negative, which shows that energy is released. The reaction is exothermic because the extra energy is released as heat into the environment.
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Missing parts;
Water can be made using the reversible reaction shown. Which change would
keep this reaction from shifting to form more of the product?
2H₂+022H₂O + energy
A. Increasing the concentration of H₂ gas in the reaction vessel
B. Decreasing the temperature in the reaction vessel
C. Removing the H₂O from the reaction vessel as it forms
D. Increasing the temperature in the reaction vessel
assume that each tablets mass was 1000 mg, and remember
Answers
The reaction rate to the nearest whole number is 36.1 mg/l/sec.
How to calculate the reaction rateTo calculate the reaction rate we would use the formula already provided which is: mass of tablet/volume of water ÷ Reaction time.
For the tablet with a 3°C Reaction time, we would calculate the rate as follows:
1000 mg * 0.2L/138.5 sec = 36.1 mg/L/sec.
The final result has all three variables and the resulting answer is the reaction rate.
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Complete Question:
Assume that each tablet's mass was 1,000 mg, and remember that you used 0,200 L of water each time,
Compute the reaction rate to the nearest whole number using the formula below,
mass of tablet/volume of water
Reaction Rate = mass reaction time
3°C Reaction time = 138.5 sec
Reaction rate = mg/l/sec