Be sure to answer all parts. Predict whether the standard entropy change for the following reactions at 25°C will be positive, negative, or too close to call. (a) 2 CO2(g) → 2 CO(g) + O2 (g) The standard entropy change is positive. The standard entropy change is negative. The standard entropy change is too close to call. (b) 3 O2(g) → 2 O3(g) The standard entropy change is positive. The standard entropy change is negative. The standard entropy change is too close to call. (c) 2 NaHCO3(s) → Na2CO3(s) + H2O(l) + CO2(g) The standard entropy change is positive. The standard entropy change is negative. The standard entropy change is too close to call.