A Na2CO3 standard solution is prepared by transferring 2.4817 g of primary
standard-grade sodium carbonate (fw = 106 g/mol) to a 250-ml volumetric flask.
Dissolving the sample in - 100 mL distilled water and diluted to the mark. A 25.0
mL aliquot is taken and titrated with 42.65 mL of HCl, calculate the
concentration of the HCl solution?
Answers
Answer:
0.1098 M
Explanation:
Related Questions
Suppose that 1500 kJ of energy were transferred to water at 20°C. A certain mass of this water is brought to the boiling point. Sketch an energy bar chart that represents the situation above. Initial Eth Eph Ech Energy Flow Final Eth E. ph Ech
Answers
The Mass of water will be 4485 g
It is given that:
heat energy = 1500 kJ
heat capacity , c = 4.18 J/g °C
initial temperature = 20.0°C
boiling of water ,final temperature = 100 °C
Q = mcΔT
m = Q / (cΔT)
m = 1500 / ( 4.18 × ( 100 °C - 20 °C )
m = 1500 / 334.4
m = 4.485 kg = 4485 g
Therefore , 1500 kJ of energy were transferred to water at 20.0°C. Heat capacity (c) for liquid water is 4.18 J/g C. mass of water could be brought to the boiling point is 4485 g.
The question is incomplete the complete question is:
Suppose that 1500 kJ of energy were transferred to water at 20.0°C. What mass of water could be brought to the boiling point? Heat capacity (c) for liquid water is 4.18 J/g C
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For the reaction below, if the rate of appearance of Br2 is 0.180 M/s, what is the rate of disappearance of
NOBr?
2 NOBr(g) → 2 NO(g) + Br2(g)
a. –0.360 M/s
b. –0.090 M/s
c. 0.090 M/s
d. 0.180 M/s
e. 0.720 M/s
Answers
Answer:
–0.360 M/s
Explanation:
Synthesis gas (a mixture of CO and H2) is increased in concentration of hydrogen by passing it with steam over a catalyst. This is the so-called water–gas shift reaction. Some of the CO is converted to CO2, which can be removed:
CO(g) + H2O(g) ⇄ CO2(g) + H2(g)
Suppose you start with a gaseous mixture containing 1.00 mol CO and 1.00 mol H2O.
When equilibrium is reached at 1000°C, the mixture contains 0.43 mol H2. What is the
molar composition of the equilibrium mixture?
Answers
Answer:
n
Explanation: n
The equilibrium mixture contains equal number of moles of products. Thus, there will be 0.43 moles of carbon dioxide. Reactants in the equilibrium state contains 0.577 moles.
What is equilibrium ?A reaction which is reversible in nature attain equilibrium when the rate of both forward reaction and backward reaction is same. The reaction arrowed to the right thus from reactants to product is called forward reaction and the opposite reaction is called backward reaction.
When the rate of forward reaction is equivalent to that of backward reaction, the system is said to be in equilibrium.
Here, the initial number of moles of water and CO was one moles each. Let x moles of both reacted and formed x moles of H2 and x moles of CO2 as per the given reaction.
At equilibrium there is 0.43 moles of hydrogen molecule and equal number of moles of carbon dioxide is formed. The number of moles of reactant will be 1 - 0.43 = 0.57 moles.
Since both reactant needs equal number of moles to react each other they both contains 0.57 moles at equilibrium.
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1. Explain how you would determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following information. You do not need to calculate an answer. Respond to the prompt with a minimum response length of 50 words.
Answers
we can determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following steps:
write the balanced chemical equation for the reactionwe obtain the standard enthalpies of formation for each compoundwe apply Hess's law calculate the enthalpy of reactionwe then add up the changes to get the total enthalpy change for the reaction State Hess law?Hess's Law of Constant Heat Summation states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.
The law is Hess's Law of Constant Heat Summation is described as a manifestation that enthalpy is a state function.
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lndicate the ionisation of the following acids,tetraoxosulphate (vi)acid,trioxonitrat
e(v)acid,ethanoic acid.
Answers
The ionization of the following acids can be represented as:
Tetraoxosulphate (VI) Acid (\(H_{2}SO_{4}\)) ionizes as H+ and SO4^2- ions.
Trioxonitrate (V) Acid (\(HNO_{3}\)) ionizes as H+ and \(NO_{3-}\) ions.
Ethanoic Acid (\(CH_{3}COOH\)) ionizes as H+ and \(CH_{3}COO^{-}\) ions.
Tetraoxosulphate (VI) Acid, also known as sulfuric acid (\(H_{2}SO_{4}\)), ionizes as follows:
\(H_{2}SO_{4}\) → \(H+\) + \(SO_{4}^{2-}\)
In this reaction, sulfuric acid donates two hydrogen ions (H+) to the solution, forming sulfate ions (\(SO_{4}^{2-}\)).
Trioxonitrate (V) Acid, commonly known as nitric acid (\(HNO_{3}\)), ionizes as follows:
\(HNO_{3}\) → \(H+_{}\) + \(NO_{3-}\)
Nitric acid dissociates to release one hydrogen ion (\(H+\)) and a nitrate ion (\(NO_{3-}\)).
Ethanoic Acid, also known as acetic acid (\(CH_{3}COOH\)), ionizes as follows:
\(CH_{3}COOH\) → H+ + \(CH_{3}COO^{-}\)
Acetic acid donates a hydrogen ion (H+) to the solution, forming an acetate ion (\(CH_{3}COO^{-}\)).
In all cases, the acids dissociate in water, producing hydrogen ions (H+) as positively charged ions and their corresponding anions. The hydrogen ions are responsible for the acidic properties of these substances, while the anions contribute to the overall charge balance in the solution. The ionization of acids allows them to conduct electricity in aqueous solutions and react with other substances.
The question was incomplete. find the full content below:
Indicate the ionization of the following acids,
Tetraoxosulphate (VI) Acid
Trioxonitrate (V) Acid
Ethanoic Acid.
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How many moles of urea (60. g/mol) must be dissolved in 77.6g of water to give a 3.5 m solution? a) 2.1 x 10^2 molb) 3.5 molc) 0.0035 mold) 0.27 mole) 7.7 x 10^2 mol
Answers
Step 1 - Remembering the definition of concentration
The molar concentration of a solution is defined as the quotient between the number of moles of solute (n) and the total volume of solution (V):
\([X\rbrack=\frac{n_x}{V}\)This equation can be read as the concentration of solute X equals its number of moles divided by the total volume of the solution.
Step 2 - Calculating the molarity of the given solution
We must discover the required number of moles of solute. We have the total volume of the solution (77.6ml) and its final concentration.
Let's substitute these in the formula:
\(\begin{gathered} [urea\rbrack=\frac{n_{urea}}{V} \\ 3.5=\frac{n_{urea}}{0.0776} \\ \\ n_{urea}=3.5\times0.0776=0.27\text{ moles} \end{gathered}\)Answer: 0.27 mol would be needed
Initial temperature of metal =
°℃
Initial temperature of water =
°℃
Final temperature of both =
√°C
Subtract to find the temperature changes
for the water and the metal.
AT (water) =
AT (metal)=-C
Answers
The temperature changes for the water and the metal can be calculated by subtracting their initial temperatures from the final temperature.
AT (water) = √°C - °℃
AT (metal) = √°C - °℃
The above equations give the temperature changes for the water and the metal, respectively. The specific values of the temperatures and the final temperature are not provided, so the actual temperature changes cannot be determined without knowing these values.
In general, the temperature change of a substance is given by the difference between the final and initial temperatures. When a warmer object comes into contact with a cooler one, heat energy is transferred from the warmer object to the cooler one until they reach thermal equilibrium, where their temperatures become equal.
The magnitude of the temperature change depends on factors such as the specific heat capacity of the substances involved and the amount of heat exchanged between them.
To accurately calculate the temperature changes, the specific heat capacities of water and the metal would be needed. Additionally, the masses or quantities of the substances would be necessary to determine the amount of heat exchanged. Without these specific values, it is not possible to provide a precise numerical answer.
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If carbon can count the shared hydrogen
atoms for itself, how many electrons are
now in carbon's outer orbital?
Answers
Answer:
Mars and Orbital code saber and the alien
why does lead exist in a higher amount in brown algae than plankton?
Answers
Lead levels in plankton and algae are high, mostly as a result of environmental pollution brought on by human activity. While it is true that some brown algae species have the ability to accumulate heavy metals like lead.
Plankton and algae have high levels of lead, mostly as a result of environmental contamination brought on by human activities including mining, industrial operations, and the burning of fossil fuels.
Due to the fact that plankton and algae take up trace quantities of lead from the surrounding water, their tissues contain greater concentrations of the metal.
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Can somebody please help me
Answers
Answer:
a
Explanation:
because this could be down to coincidences whereas the others could be explained with scientific experiments
Answer:
A
Explanation:
Must be testable - A is not
Which is more massive, the nucleus OR empty space?
Answers
Answer:
Empty space
Explanation:
Empty space could be endless sometimes.
C6H12O6 + 602 → 6CO2 + 6H₂O
The most efficient ratio is
1 C6H12O6 6 02.
Which set of reactants will be the most
efficient (least wasteful of materials) for
the reaction?
A. 1.0 mol C6H12O6 and 3.0 mol O₂
B. 1.5 mol C6H₁2O6 and 3.0 mol O₂
C. 3.0 mol C6H₁2O6 and 6.0 mol O₂
D. 0.5 mol C6H₁2O6 and 3.0 mol O₂
Answers
Answer:
D
Explanation:
The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.
PLEASE HELP!!
ATTACHMENT BELOW
Answers
Answer:
read the story
Explanation:
read it and then you will find the answer
How is density calculated given mass and volume?
A.Mass divided by volume
B.Mass multiplied by volume
C.Sum of volume and mass
D.Difference of volume
and mass
Answers
BRAINLIEST 20 POINTS!!
Nonmetals lose electrons to form cations. Do the cations have a smaller or larger ionic radius than the neutral atom from which they were formed? Why?
Answers
Answer:
Cations have a smaller ionic radius than the neutral atom from which they were formed because its nucleus becomes more positively charged when an atom loses electrons. Thus it attracts any remaining electrons more strongly, resulting in a smaller size.
Explanation:
The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
Answers
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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help ;)...............
Answers
Answer:
Option A.
Its a Beta Decay.
It is characterized by an Increase in the atomic Number of the of the product and No Change in the Mass Number of number of the product.
which best describes how heat energy moves within the system?
Answers
Answer: B
Heat always travels from warmer areas to cooler areas in the form of radiation or convection currents due to the temperature difference. You could kind of think of this movement like diffusion: travelling from a higher concentration to a lower one (if you take biology). This is how a gas heats up a pan on the stove or a radiator warms a room
Which action demonstrates a CHEMICAL CHANGE?
A- Long hair is cut and dried.
B- A wooden pencil is sharpened and breaks
C- An ice cube melts and becomes a clear liquid.
D- An iron nail becomes orange and flaky on the surface.
Answers
If 40g KCI are dissolved in 100g of water at 20 degrees C, what type of solution does
it form?
Answers
Answer:
neutral
Explanation:
dss
PLEASE HELP QUICKLY!!!
HI gas is removed from the system
at equilibrium below. How does the
system adjust to reestablish
equilibrium?
51.8 kJ + H₂(g) + 1₂(g) = 2HI(g)
A. The reaction shifts to the right (products) and the concentrations
of I, and H₂ decrease.
B. The reaction shifts to the left (reactants) and the concentrations
of H₂ and I increase.
C. The reaction shifts to the right (products) and the concentrations
of I, and H₂ increase.
D. The reaction shifts to the left (reactants) and the concentration of
HI increases.
Answers
Answer:
A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.
Explanation:
If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.
In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.
HQ5.40
Homework Answered Due Today, 11:59 PM
The reaction 3H₂(g) + N₂(g) → 2NH3(g) has an enthalpy of reaction of -92.6 kJ/mol. If 1 g of hydrogen and 2 g of nitrogen are
reacted, how much heat is produced (kJ)?
Answers
The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ
How do i determine the heat energy produced?First, we shall obtain the limiting reactant. Details below:
3H₂ + N₂ -> 2NH₃
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 g Molar mass of H₂ = 2 g/molMass of H₂ from the balanced equation = 3 × 2 = 6 gFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂
We can see that only 0.43 g of H₂ is needed in the reaction.
Thus, the limiting reactant is N₂
Finally, we the amount of heat energy produced. Details below:
3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 gFrom the balanced equation above,
When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.
Therefore,
When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ
Thus the heat energy produced from the reaction is -6.61 KJ
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Which of the following is the correct set-up for the problem: How many grams of water will be produced from 3.2 moles of oxygen and an excess of C2H4?
Answers
Option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.
Reaction between oxygen and etheneEthene (C2H4) burns in the presence of oxygen (O2) to form carbon dioxide (CO2) and water (H2O) along with the evolution of heat and light.
C₂H₄ + 3O₂ ----- > 2CO₂ + 2H₂O
from the equation above;
3 moles of O₂ ---------> 2(18 g) of water
3.5 moles of O₂ ----------> x
\(x = 3.2 \times [\frac{2 \ moles \ H_2O}{3 \ moles \ O_2} ] \times[ \frac{18.02 \ g \ H_2O}{1 \ mole \ H_2O} ]\)
Thus, option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.
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Ibuprofen can be found in 800 mg doses in over-the-counter analgesics, such as Advil and Motrin. How many grams of iburofen
does such a tablet contain?
800 mg =
g
Answers
The grams of iburofen does such a tablet contain 800 mg = 0.8g Ibuprofen
1 g = 10^-3g = .001g
Ibuprofen has 800 mg doses in over-the-counter analgesic
800g = 800 × .001
= 0.8g
Ibuprofen is Nondteriodal Anti-inflammatory Drug (NSAID)Ibuprofen's Mechanism of Action is Decreases inflammation, pain, and fever through inhibition of cyclooxygenase activity and prostaglandin synthesisnonsteroidal anti-inflammatory medication (NSAID) used for pain relief and to reduce fever by stops inflammation and by blocking formation of cyclo-oxygenase (COX-2) a chemical mediator of inflammatory chemicals. i.e prostaglandinsIt comes under the Class analgesic (reduce pain) and antipyretic (FIRE - reduce fever)e side effects of ibuprofen NSAID are peripheral edema, fluid retention with edema, tinnitus, purpura, petechiae, anorexia, diarrhea, rash, nausea, vomiting, fatigue, dizziness, lightheadedness, anxiety, confusionTo know more about analgesic visit :
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A student studied the weather conditions over a one-week period by measuring the outside temperature at the same time each day. She measured the following temperatures: Day 1: 24 °C Day 2: 22 °C Day 3: 21 °C Day 4: 23 °C Day 5: 21 °C Day 6: 20 °C Day 7: 18 °C What is the range of her data set?
Answers
Answer:
6°C
Explanation:
The range of a data set is the difference between the maximum and minimum values.
In this case, the maximum temperature is 24°C and the minimum temperature is 18°C. Therefore, the range is:
Range = Maximum value - Minimum value
Range = 24°C - 18°C
Range = 6°C
So the range of the student's data set is 6°C.
Answer: 6°C
The range of a data set is the difference between the maximum and minimum values.
The maximum temperature = 24°C
The minimum temperature = 18°C
Therefore, the range is:
Range = Maximum value - Minimum value
Range = 24°C - 18°C
Range = 6°C
So the range of the student's data set is 6°C.
is potenial energy the one that moves?
Answers
Answer:
Potential energy of an object is found in its position, not its motion.
Explanation:
Brainliest if this helped please!
Answer:
No that Kinetic Energy.
Explanation:
Potential Energy means it's at its highest point and its not moving so its storing up that energy. Kinetic Energy is when the object is using that energy so its using the Potential energy and turning into Kinetic Energy.
Brainliest Please if you likes the answer.
Which statement is accurate about variations?
Organisms with variations that give an advantage are more likely to survive
Organisms with variations are less likely to pass these variations to their offspring
In all cases vanations become more common in a population
In all cases variations affect how likely it is that an organism reproduces
Answers
Answer:
A,C,D
Explanation:
Variations effect the likelyhood of survival for a organism, it can give off an advantage or disadvantage.
Brainliest? pls
What is the difference between the R.M.M. and the molar mass of a compound?
Answers
Answer:
rmm doesn't need to include unit and molar mass need to include unit
Consider 5.00 L of a gas at 365 mmHg and 20. ∘C . If the container is compressed to 2.30 L and the temperature is increased to 40. ∘C , what is the new pressure, P2, inside the container? Assume no change in the amount of gas inside the cylinder.
Answers
Answer:
P₂ = 1.12 atm
Explanation:
To find the new pressure, you need to use the Combined Gas Law:
\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the new pressure, volume, and temperature. Before plugging the values into the equation, you need to
(1) convert the pressure from mmHg to atm (760 mmHg = 1 atm)
(2) convert the temperatures from Celsius to Kelvin (°C + 273)
The final answer should have 3 sig figs like the given values.
P₁ = 365 mmHg / 760 = 0.480 atm P₂ = ? atm
V₁ = 5.00 L V₂ = 2.30 L
T₁ = 20°C + 273 = 293 K T₂ = 40°C + 273 = 313 K
\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\) <----- Combined Gas Law
\(\frac{(0.480 atm)(5.00 L)}{293 K}=\frac{P_2(2.30 L)}{313 K}\) <----- Insert values
\(0.00819=\frac{P_2(2.30 L)}{313 K}\) <----- Simplify left side
\(2.56 = P_2(2.30L)\) <----- Multiply both sides by 313
\(1.12 = P_2\) <----- Divide both sides by 2.30
Which probing question lies within the scope of physics?
O A.
Are fish in the open ocean
attracted by underwater sounds?
O B.
Does increasing the saltiness of
ocean water affect the speed
of sound in the water?
O C.
What effect does the release of industrial wastewater have on
the acidity of oceans?
D. What is the effect of rising sea temperatures on
ocean currents?
Answers
Answer:
answer number C is the correct answer for this