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Stoichiometry

Stoichiometry
pH value of an alkaline solution is

> 7
Constant over a wide range
7
< 7

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Stoichiometry
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

1225
1735
1525
1335

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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
M/s
Cm/s
Kmole/m².s.Pa

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Stoichiometry
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. Mole fraction of water vapour in the product gases is about

0.67
0.40
0.33
0.19

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Stoichiometry
For a neutral solution (pH = 7), the value of[H⁺] [OH⁻] is equal to

> 1
< 1
1

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Stoichiometry
The effect of pressure on the heat capacity of the gases __________ is negligible.

Below the critical temperature
At pressure below one atmosphere
Neither A nor B
Both A & B

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