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Stoichiometry

Stoichiometry
Solutions which distil without change in composition are called

Supersaturated
Ideal
Azeotropic
Saturated

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Stoichiometry
The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

0.6
0.8
0.2
0.4

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Stoichiometry
What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?

AB₂
AB₃
A₂B₃
A₂B

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Stoichiometry
A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to

X1/x2
X2/x1
1 - (x1/x2)
1/x2

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Stoichiometry
Pick out the wrong unit conversion of heat transfer rate.

1 Watt = 1.163 kcal/hr
1 kcal/m².hr = 0.3687 BTU/ft².hr = 1.163 Watt/m²
1 BTU/ft².hr = 2.712 kcal/m².hr
1 kcal/hr= 1.163 Watt

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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

1735
1335
1225
1525

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