Chemical Engineering - Stoichiometry

26. 

Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules

A. do not lose energy on collision.
B. are above the inversion temperature.
C. do not exert attractive force on each other.
D. do work equal to loss in kinetic energy.

Answer: Option C

Explanation:

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27. 

Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the

A. nature of the liquid.
B. nature of the gas.
C. temperature of the liquid. id) total pressure.

Answer: Option B

Explanation:

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28. 

Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity ? Vapour pressure of water at 20°C is 17.5 mm Hg.

A. 80.38
B. 80
C. 79.62
D. 78.51

Answer: Option C

Explanation:

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29. 

One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to

A. 1225
B. 1335
C. 1525
D. 1735

Answer: Option D

Explanation:

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30. 

As per Kirchoff s equation, the heat of reaction is affected by the

A. pressure
B. volume
C. temperature
D. molecularity

Answer: Option C

Explanation:

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