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Stoichiometry

Stoichiometry
Number of gm moles of solute dissolved in 1 kg of solvent is called its

Molality
Molarity
Formality
Normality

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Stoichiometry
Which of the following is an exothermic reaction?

Decomposition of water
None of these
Conversion of graphite to diamond
Dehydrogenation of ethane to ethylene

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Stoichiometry
Size range of the colloidals particles is

10 - 50 Angstrom
50 - 200 microns
5 - 200 milli-microns
500 - 1000 microns

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Stoichiometry
Pick out the wrong unit conversion of calorific value.

1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
1 kcal/m³ = 0.1124 BTU/ft³
1 BTU/ft³ = 8.9 kcal/m³ = 0.038 MJ/m³
1 BTU/lb = 2.3 kcal/kg

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Stoichiometry
For an endothermic reaction, the minimum value of energy of activation will be (where, ΔH = enthalpy of the reaction)

>ΔH
Δ H

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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

M/s
Mole/m².s.Pa
Cm/s
Kmole/m².s.Pa

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