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  4. When one mole of zinc dust and one mole of sulphuric acid react in a bomb calorimeter, then Δ U and w correspond to

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Q. When one mole of zinc dust and one mole of sulphuric acid react in a bomb calorimeter, then $\Delta U$ and $w$ correspond to

NTA AbhyasNTA Abhyas 2022

Solution:

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 $\Delta U=q=-ve$ (exothermic reaction) .
$\Delta U \, < 0,w= \, 0$