# Chemical Process Calculation Questions and Answers – Concentration-II

This set of Chemical Process Calculation Interview Questions and Answers for experienced focuses on “Concentration-II”.

1. What is the molarity of a solution made by diluting 500 mL of a 2.50 M solution to a final volume of 800 mL?
a) 0.5265 M
b) 1.5625 M
c) 2.5689 M
d) 3.4586 M

Explanation: Molarity = Moles / Volume.

2. What is the concentration of 44 grams of CO2 occupying 2 m3 volume?
a) 0.5 mole / m3
b) 0.4 mole / m3
c) 0.3 mole / m3
d) 0.2 mole / m3

Explanation: Concentration = moles / Volume = 1/2.

3. What is mass of the solute that is present in 50 mL of a 0.15 mol/L solution of NaCl?
a) 0.22
b) 0.44
c) 0.66
d) 0.88

Explanation: Concentration = Moles / Volume.

4. What is the concentration of 560 gm H2SO4 solution in 486 mL solution?
a) 11.75 mole / L
b) 1.152 gm / mL
c) Both a and b
d) Only b

Explanation: Concentration = Moles or Mass / Volume.

5. A 1000 ml solution has 0.25 gms of solute. What is the concentration(gm/L)?
a) 0.25
b) 2.5
c) 25
d) 250

Explanation: Concentration = Mass / Volume.

6. Which one is the most concentrated solution?
a) 20 g of NaOH in 100 mL of water
b) 150 g of NaOH in 200 mL of water
c) 180 g of NaOH in 300 mL of water
d) 250 g of NaOH in 600 mL of water

Explanation: Concentration = Mass / Volume.

7. How many gms of NaCl are required to prepare 2.5 L of 0.6 M solution?
a) 22
b) 44
c) 66
d) 88

Explanation: Molarity = Moles / Volume.

8-10. Mass fraction and mole fraction are defined as the mass or mole of the interested substance divided by the total moles or mass.
NaClO3 is given for the calculation.
8. What is the mass fraction of Na?
a) 0.216
b) 0.418
c) 0.625
d) 0.856

Explanation: Mass fraction = Mass of Na / Total Mass.

9. What is the mole fraction of Cl?
a) 0.2
b) 0.4
c) 0.6
d) 0.8

Explanation: Mole fraction = Moles of Cl / Total Moles.

10. What is the sum of mass and mole fraction of Oxygen?
a) 1.05
b) 2.05
c) 3.05
d) 4.05

Explanation: Mass fraction = Mass of Na / Total Mass & Mole fraction = Moles of Cl / Total Moles.

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To practice all areas of Chemical Process Calculation for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.

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