Stoichiometry problems
- 1. In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is
Options- A. 180
- B. 60.3
- C. 720
- D. 200 Discuss
Correct Answer: 60.3
- 2. How much O2 can be obtained from 90 kg of water?
Options- A. 32 kg
- B. 80 kg
- C. 64 kg
- D. 90 kg Discuss
Correct Answer: 80 kg
- 3. The quantity of heat required to evaporate 1 kg of a saturated liquid is called
Options- A. specific heat
- B. 1 Kcal
- C. sensible heat
- D. latent heat Discuss
Correct Answer: latent heat
- 4. For the gaseous phase reaction, N2 + O2⇌2NO, ?H = + 80 kJ/kg. mole; the decomposition of NO is favoured by
Options- A. increasing the concentration of N2.
- B. decrease in temperature.
- C. increase in pressure.
- D. decrease in pressure. Discuss
Correct Answer: decrease in temperature.
- 5. The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately
Options- A. 0.07
- B. 0.09
- C. 0.11
- D. 0.13 Discuss
Correct Answer: 0.13
- 6. Addition of a non-volatile solute to a pure solvent
Options- A. increases its freezing point.
- B. increases its boiling point.
- C. decreases its freezing point.
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
- 7. What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?
Options- A. AB3
- B. A2B3
- C. A2B
- D. AB2 Discuss
Correct Answer: AB3
- 8. Vapor pressure of a solution is proportional to(where, Sv and St are mole fraction of solvent and solute respectively).
Options- A. Sv
- B. 1/St
- C. St
- D. 1/Sv Discuss
Correct Answer: Sv
- 9. A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is
Options- A. 380
- B. 630
- C. 760
- D. 880 Discuss
Correct Answer: 630
- 10. Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces?
Options- A. RT
- B.
- C. (V - b)
- D. 1/RT Discuss
Correct Answer: RT
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