STANDARD Physics Heat Capacities MCQ Question with Solution

The heat capacity per mole of water is- (R is universal gas constant)

A

9R

B

$\frac{9}{2}R$

C

6R

D

5R

Correct Answer

Option A

Detailed Explanation

Water is treated like a solid. For each atom, the average energy is $3k_B T$ . A water molecule has three atoms, so the total energy of one mole of water is $U = 3 \times 3k_B T \times N_A = 9RT$ . Thus, the heat capacity per mole of water is $C = \frac{\Delta Q}{\Delta T} = \frac{\Delta U}{\Delta T} = 9R$ .

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STANDARD Physics Heat Capacities MCQ Question

Correct Answer

Detailed Explanation

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