Chemistry

Problem

For the reaction

\mathrm{A \rightarrow B}

carried out at constant pressure, the enthalpy change is

\Delta H = +125\,\text{kJ\,mol}^{-1}

. If 0.50 mol of A reacts completely under these conditions, determine: (a) whether the reaction is endothermic or exothermic, (b) the numerical value and sign of

q_{\text{system}}

for the 0.50 mol reaction event.

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