Question

Question 1 For which one of the following reactions is ASº negative? Not yet answered Marked out of 1.0 Select one: O a. 2 IBr(g) → 12(s) + Brz(1) P Flag question O b. 3 H2(g) + Fe2O3(s) → 2 Fe(s) + 3 H2O(g) O C. 2 NO2(g) → N2(g) + 2 O2(g) O d. C6H6(s) → C6H6(1) o e. (NH4)2CO3(s) → 2 NH3(g) + H2O(g) + CO2(g)

Answer 1

The answer is first one.

In option B 3 moles of gas reacts with a mole of solid to form 3 moles of gas and 2 moles of solid. So the entropy can not be negative

In option C 2 moles of gas decomposes to 4 moles of two different gases.

In option D the phase transition from solid to liquid leads to increase entropy

In option E solid decomposes to gases

In option A 2 moles of gases forming two moles of different solid and liquid. So the entropy should be negative.