Q. For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $\mathrm{\Delta}U$ and $W$ correspond to
A) $\mathrm{\Delta}U < 0,\ W = 0$
B) $\mathrm{\Delta}U = 0,\ W < 0$
C) $\mathrm{\Delta}U > 0,\ W = 0$
D) $\mathrm{\Delta}U = 0,\ W > 0$
Explanation
(a)
Bomb calorimeter is commonly used to find the heat of combustion of organic substance 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 $\mathrm{\Delta}U = q$. Thus it has $\mathrm{\Delta}U < 0,\ W = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.