For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $\D

Question

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $\Delta U$ and $w$ correspond to\

Professor PC Thomas Classes · Answer

(a) : The reaction in a bomb calorimeter proceeds at constant volume so, $w=0$ and $\Delta U=q$. 
$ \mathrm{Zn}+\mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \mathrm{ZnSO}_4+\mathrm{H}_2 $
This reaction is exothermic. So some heat will be evolved which will result in lowering of internal energy.
 Hence, $\Delta U<0, w=0$.