Chemistry

Problem

A process occurs in two consecutive steps: Step 1 A → B

\Delta H = +50\,\text{kJ}

Step 2 B → C

\Delta H = -120\,\text{kJ}

Determine the sign (positive or negative) of the overall

\Delta H

for the conversion of A to C and state whether the overall process is exothermic or endothermic.