Of and are and respectively

CHEMISTRY · Subjective · CBSE · Chemistry · Thermodynamics · Thermodynamics

Problem

\Delta H_f^\circ

\text{Fe}_2\text{O}_3

and

\text{Al}_2\text{O}_3

are

-189 \text{ kJ mol}^{-1}

and

-405 \text{ kJ mol}^{-1}

respectively. How much heat (in kJ) is given out during reaction of 1 g Al according to

2\text{Al} + \text{Fe}_2\text{O}_3 \longrightarrow \text{Al}_2\text{O}_3 + 2\text{Fe}