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Stoichiometry

Stoichiometry
The value of the gas-law constant 'R' is 1.987

Kcal/kg-mole.°K
Btu/lb-mole.°R
Kcal/kg-mole.°C
Both B & C

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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
M/s
Cm/s
Mole/m².s.Pa

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Stoichiometry
The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be __________ times.

43832
4
43834
√2

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Stoichiometry
Two solutions A₁ and A₂ have pH value of 2 and 6 respectively. It implies that the solution

Both A & C
A₁ is highly acidic
A₁ is more alkaline than solution A₂
A₁ is very slightly acidic

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Stoichiometry
1 ata is equivalent to

10 torr
1 kgf/cm²
1 atm
0.98 Pascal

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Stoichiometry
S.T.P. corresponds to

101.325 kPa gauge pressure & 15.5°C
1 atm. absolute pressure & 15.5°C
760 mm Hg gauge pressure & 15.5°C
760 torr & 0°C

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