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Stoichiometry

Stoichiometry
Internal energy of a substance comprises of the __________ energy.

All of these
Rotational
Vibrational
Translational

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

4.97
2.42
1
None of these

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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

Mole/m².s.Pa
Cm/s
M/s
Kmole/m².s.Pa

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Stoichiometry
The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

0.2
0.8
0.4
0.6

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Stoichiometry
A solution of specific gravity 1 consists of 35% A by weight and the remaining B. If the specific gravity of A is 0.7, the specific gravity of Bis

1.3
1.25
1.35
1.2

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Stoichiometry
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

140
485
350
345

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