Stoichiometry - Practice Test

[#251] The vapor pressures of benzene and toluene are 3 and $$frac{4}{3}$$ 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

(A) 0.4

(B) 0.6

(C) 0.8

(D) 0.2

Correct Answer

(B) 0.6

[#252] Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

(A) Sizes of the component molecules are approximately equal

(B) Attractive forces between like and unlike molecules are approximately equal

(C) Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution

(D) All of the above

Correct Answer

(D) All of the above

[#253] Kopp's rule is useful for the determination of

(A) Molal heat capacities of gases

(B) Heat capacities of solids

(C) Activation energy

(D) Heat capacities of gases

Correct Answer

(B) Heat capacities of solids

[#254] Heat capacity of air can be approximately expressed as, C p = 26.693 + 7.365 × 10 -3 T, where, C p is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to -100°C is

(A) 10.73 kJ

(B) 16.15 kJ

(C) 18.11 kJ

(D) 18.33 kJ

Correct Answer

(C) 18.11 kJ

[#255] A sugar solution containing __________ percent sugar is equivalent to 1 Brix.

(A) 0.01

(B) 0.1

(C) 1

(D) 10

Correct Answer

(C) 1

Stoichiometry - Study Mode

[#251] The vapor pressures of benzene and toluene are 3 and $$frac{4}{3}$$ 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

Correct Answer

[#252] Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

Correct Answer

[#253] Kopp's rule is useful for the determination of

Correct Answer

[#254] Heat capacity of air can be approximately expressed as, C p = 26.693 + 7.365 × 10 -3 T, where, C p is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to -100°C is

Correct Answer

[#255] A sugar solution containing __________ percent sugar is equivalent to 1 Brix.

Correct Answer