Question

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

• A. $\Delta U<0, w=0$
• B. $\Delta U<0, w<0$
• C. $\Delta U>0, w=0$
• D. $\Delta U>0, w>0$

Answer 1

Answer: (A)

In bomb calorimeter, heat of combustion is determined at constant volume, hence heat of reaction corresponds to $\Delta U$
$\therefore \Delta U <0$
$W =0$