One mole of methane undergoes complete combustion in a stoichiometric amount of

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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. ?H�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
Options
A. 1225
B. 1335
C. 1525
D. 1735

Correct Answer

1735

Stoichiometry problems

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1. "The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface". This statement pertaining to the solubility of gases in liquid is the __________ law.
Options
A. Raoult's
B. Henry's
C. Amgat's
D. none of these

3. No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules
Options
A. collide without loss of energy.
B. do work equal to loss in kinetic energy.
C. are above the inversion temperature.
D. exert no attractive force on each other.

4. Pick out the correct statement.
Options
A. Heat of solution is always positive.
B. At equilibrium, ?G is zero.
C. For the reaction, PCl₅⇌PCl₃ + Cl₂, ?G is less than ?E
D. The heating of water in a beaker is an example of an isolated system.

7. 80 kg of Na₂SO₄ (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na₂SO₄ .10H₂O crystals separate out. The weight fraction of Na₂SO₄ in the remaining solution is
Options
A. 0.00
B. 0.18
C. 0.24
D. 1.00

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