Q101 · CSIR-NET Chemistry, June 2014

Paper: CSIR-NET June 2014 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Laws State Functions · Marks: 2 · Difficulty: Medium

In a bomb calorimeter, the combustion of 0.5 g of compound A (molar mass $=50 \mathrm{g} \mathrm{mol}^{-1}$ ) increased the temperature by 4 K . If the heat capacity of the calorimeter along with that of the material is $2.5 \mathrm{kJ} \mathrm{K}^{-1}$, the molar internal energy of combustion, in kJ , is
(a)1000
(b)-1000
(c)20
(d)-20
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
q_V = −CΔT = −2.5 × 4 = −10 kJ for 0.01 mol ⇒ ΔU_comb = −1000 kJ mol⁻¹.

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