Question

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, pick the correct option:

• 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

The correct option is A $\Delta U<0,w=0$

Bomb calorimeter is commonly used to find the heat of combustion of organic substances which consists of a sealed combustion chamber, called a bomb. If a process is run in a sealed container then no expansion or compression is allowed, so w = 0 and $\Delta U=q$.
$\Delta$U < 0, w = 0, as this reaction is exothermic.