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Stoichiometry

Stoichiometry
1 Kcal/kg. °C is equivalent to __________ BTU/lb. °F.

1
4.97
2.42
None of these

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Stoichiometry
A vessel of volume 1000 m³ contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately

34
20
25
17

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Stoichiometry
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are PvB and Pvw respectively. The partial pressure of benzene in air-vapour mixture is

XB.PvB
PvB
(Patm - Pvw)xB
XB.Patm

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Stoichiometry
The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent.

Either more or less; depends on the solvent
More than
Equal to
Less than

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Stoichiometry
Which of the following is not used for computing latent heat of vaporisation?

Hess
Clausius-Clayperon equation
Reference substance plots based on Durhing & Othmer plots
Kistyakowasky's equation

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Stoichiometry
Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74xl0-5m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. Its units are

Kmole/m².s.Pa
Mole/m².s.Pa
M/s
Cm/s

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