Stoichiometry MCQs

Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

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

The value of Trouton's ratio $$\left( {\frac{{{\lambda _{\text{b}}}}}{{{{\text{T}}_{\text{b}}}}}} \right)$$  for a number of substances is 21 (where, $${{\lambda _{\text{b}}}}$$ = molal that of vaporisation of a substance at its normal boiling point, kcal/kg.mole and T_b = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids.

Vapor pressure of a solution is proportional to (where, S_v and S_t are mole fraction of solvent and solute respectively).

One micron is equal to __________ cm.

A vapor whose partial pressure is less than its equilibrium vapor pressure is called the __________ vapor.

Osmotic pressure of the solution can be increased by

Pick out the wrong statement.

pH value of H₂SO₄ (5% concentration) is