Predict whether the standard entropy change for the following reaction at 25 deg
ID: 1015385 • Letter: P
Question
Predict whether the standard entropy change for the following reaction at 25 degree C will be positive, negative, or too close to call. (a) 2 CO_2(g) rightarrow 2 CO(g) + O_2(g) A. The standard entropy change is positive. B. The standard entropy change is negative. C. The standard entropy change is too close to call. (b) 3 O_2(g) rightarrow 2 O_3(g) A. The standard entropy change is positive. B. The standard entropy change is negative. C. The standard entropy change is too close to call. (c) 2 NaHCO_3(s) rightarrow Na_2CO_3(s) + H_2O(l) + CO_2(g) A. The standard entropy change is positive. B. The standard entropy change is negative. C. The standard entropy change is too close to call.Explanation / Answer
(a) For 2CO2(g) ---> 2CO(g) + O2(g)
moles of gas is increasing on the product side so,
A. The standard entropy chnage is positive
(b) For 3O2(g) ---> 2O3(g)
moles of gas is reducing so,
B. entropy change is negative
(c) For 2NaHCO3(s) --> Na2CO3(s) + H2O(l) + CO2(g)
moles of gas on product end is higher so,
A. The standard entropy change is positive