A reaction has an enthalpy change of for the process

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

A reaction has an enthalpy change of

+50\,\text{kJ}

for the process

\mathrm{A}(g)\to\mathrm{B}(g)

. What is the enthalpy change for the process

2\,\mathrm{B}(g)\to2\,\mathrm{A}(g)

? (a)

+100\,\text{kJ}

(b)

-50\,\text{kJ}

(c)

-100\,\text{kJ}

(d)

+50\,\text{kJ}