The reaction A(g)→ B(g)is spontaneous under standard conditions.Which of the following statements must be true? I.The reaction B(g)→ A(g)is nonspontaneous under standard conditions.
II.A(g)will be completely converted to B(g)if sufficient time is allowed.
III.A(g)will be completely converted to B(g)rapidly.

Question

Quizplus · Accepted Answer

I is true because if the reaction A(g) → B(g) is spontaneous, the reverse reaction B(g) → A(g) is nonspontaneous under the same conditions due to the directionality of spontaneity. II and III are not necessarily true because spontaneity does not guarantee completion or rate of the reaction.

The Reaction A(g)→ B(g)is Spontaneous Under Standard Conditions