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Question

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


A
U<0,w=0
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B
U<0,w<0
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C
U>0,w=0
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D
U>0,w>0
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Solution

The correct option is A $$\triangle U < 0, w = 0$$
$$Zn + H_{2}SO_{4} = ZnSO_{4} + H_{2}$$

In bomb calorimeter, there is no expansion in volume, so, work done will be zero. 

This reaction is exothermic. So, some heat will be evolved which will result in lowering of internal energy.

 Hence,$$\triangle U < 0$$ & $$w = 0$$.

Physics

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