The heat change for the following reaction at 298 K and constant pressure is +7.3 kcal. $A_2B(s) \rightarrow 2A(s) + \frac{1}{2} B_2(g)$; $\Delta H = + 7.3 kcal$ The heat change at constant volume would be

Question

(a) +7.3 kcal
(b) More than +7.3 kcal
(c) Less than +7.3 kcal
(d) Zero