How many grams of a stock solution that is 92.5 percent H2SO4 by mass would be needed to make 250 grams of a 35.0 percent by mass solution? Show all of the work needed to solve this problem.

Answers

Answer 1

Answer:

M1m1 = M2m2

where M1 is the concentration of the stock solution, m1 is the mass of the stock solution, M2 is the concentration of the new solution and m2 is its new mass.

M1m1 = M2m2

.925(m1) = .35(250)

m1 = 94.59 g

Answer 2

Answer:

Answer: 94.59 grams of 92.5 % $H_2SO_4$ by mass solution will be needed.

Explanation:

Mass of sulfuric acid is 250 grams of 35 % by mass solution:

$35=(x)/(250 g)* 100$

$x=87.5 g$

Mass of $H_2SO_4$ in 250 g of 35 % solution = 87.5 g

Mass of 92.5 % $H_2SO_4$ needed to make 35 % by mass solution.

$92.5=\frac{87.5 g}{\text{mass of the solution required}}* 100$

Mass of the solution required = 94.59 g

94.59 grams of 92.5 % $H_2SO_4$ by mass solution will be needed.

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Find a mole of 0.0960 g of H2SO4

If 2.0 mL of 6.0M HCl is used to make a 500.0-mL aqueous solution, what is the molarity?

Answers

Answer:

0.024M

Explanation:

Data obtained from the question include:

C1 = 6M

V1 = 2mL

C2 =?

V2 = 500mL

The molarity of the diluted solution can be obtained as follows:

C1V1 = C2V2

6 x 2 = C2 x 500

Divide both side by 500

C2 = (6 x 2) /500

C2 = 0.024M

The molarity of the diluted solution is 0.024M

Answer:

The molarity is 0.024 mol / L

Explanation:

Molarity = Number of moles / Volume of solution

= (6.0 mol/L x 2.0 x $10^(-3)$ L) / 0.500 L

= 0.024 mol / L

__________ What is the value of the activation energy for the forward reaction? Be sure to include theappropriate sign.

Answers

Answer:

+60 kJ

Explanation:

Activation energy = PE(AB) - PE(A+B) = 100 -40 = +60 kJ

Burning alcohol for fuel is a very efficient process. Please select the best answer from the choices provideda. True
b. False

Answers

Explanation:

Burning of alcohol produces different products as it depends on the type and nature of alcohol which is being burnt.

Some alcohols upon burning produce toxic gases or products whereas some alcohols on burning does not produce any toxic substances.

For example, when ethanol is burnt then it reacts with oxygen and results in the formation of water and carbon dioxide.

Thus, we can conclude that the statement burning alcohol for fuel is a very efficient process is a false statement.

Burning alcohol for fuel has been used throughout history. There are some alcohols that are the best ones to use as fuels because of their nature and can be synthesized chemicaly or biologicaly. Except, some of those alcohol also has a bad effect when burned for fuel as it would cause serious negative chemical effects when exposed to the human body such as blindness or death. Therefore, the best answer would be False.

How many moles of NO3 are there in 6.2g

Answers

6.2 divided by the mass number of NO3 is 0.1 moles.

What is the mass/volume percent of a solution with 75g of Na2CO3 dissolved in 20.0 g of water?11%

9.3 %

30%

7.5%

Answers

Answer:

percent by mass = 79%

Explanation:

Data Given:

mass of solute (Na₂CO₃) = 75 g

mass of solvent ( water ) = 20 g

mass percent of solution = ?

Solution:

Formula used to find percent by mass

mass of solute / mass of solution x 100 . . . . . . (1)

first we have to find mass of solution

mass of solution = mass of solute + mass of Solvent . . . . (2)

put values in equation 2

mass of solution = 75 g + 20 g

mass of solution = 95 g

Now,

put values in equation 1

Percent by mass = mass of solute / mass of solution x 100

Percent by mass = 75 g / 95 g x 100

Percent by mass = 79 %

so,

The percent of the solution by mass = 79%

***Note:

The same work can be used for the other values too i.e. if you have 20 g of solute and 75 g solvent.

Answer:

The answer is 78.9%

Explanation:

The percentage weight in volume indicates the mass of solute per volume. We will use the% weight/volume formula to calculate what the exercise asks for, as follows: $%weight/volume=(solute weight)/(solution volume)x100%= (75 g)/(75+20)= 78.9%$

$percent Weight/volume=(solute weight)/(solution volume)x100=(75 g)/(75+20)x100=78.9$ %

An element has 8 protons and 8 neutrons in its nucleus and 8 electrons revolving around the nucleus. What is the atomic number and atomic mass of this element? The atomic number is 16 and the atomic mass is 8. The atomic number is 8 and the atomic mass is 8. The atomic number is 8 and the atomic mass is 16. The atomic number is 16 and the atomic mass is 4. The atomic number is 4 and the atomic mass is 16.

Answers

The mass of an atom comes from the protons and neutrons that are found in the nucleus. The number of protons is the atomic number of an element. To find the number of neutrons, subtract the atomic number from the mass of an atom. The atomic number is 8 and the atomic mass is 16.

Other Questions

A solution of methanol and water has a mole fraction of water of 0.312 and a total vapor pressure of 211 torr at 39.9 ∘C. The vapor pressures of pure methan ol and pure water at this temperature are 256 torr and 55.3 torr, respectively. ls the solution ideal? If not, what can you say about the relative strengths of the solute-solvent interactions compared to the solute-solute and solvent-solvent interactions?

The law of conservation of energy states that when one form of energy is converted into another,a. energy is destroyed in the process. b. no energy is destroyed in the process. c. energy is created in the process. d. some amount of energy cannot be accounted for.

Water _____.dissolves in most substancesheats and cools very quicklyis always 100% pureis neither an acid nor a base

How do you get from mass to moles in this problem?