Predict whether the standard entropy change for the following reactions at 25deg

Question

Predict whether the standard entropy change for the following reactions at 25degreeC will be positive, negative, or too close to call. 2 CO_2(g) rightarrow 2 CO(g) + O_2 (g) The standard entropy change is positive. The standard entropy change is negative. The standard entropy change is too close to call. The standard entropy change is positive. The standard entropy change is negative. The standard entropy change is too close to call. 2 NaHCO_3(s) rightarrow Na_2C0_3(s) + H_2O(l) + CO_2(g) The standard entropy change is positive. The standard entropy change is negative. The standard entropy change is too close to call.

Explanation / Answer

a) as No of mol of gaseous products is greater than reactants.so that

the standard entropy is positive.

answer: A

b) No of mol of gaseous products is less than reactants.so that

the standard entropy is negative.

answer: B

C) as No of mol of gaseous products is greater than reactants.

answer: A

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