Question

The molar heat capacity of a certain substance varies with temperature according to the given equation, C = 27.2 + (4 × 10^–3) T. The heat necessary to change the temperature of 2 mol. of the substance from 300K to 700K is –

• A. 3.46 × 10⁴J
• B. 2.33 × 10³J
• C. 3.46 × 10³J
• D. 2.33 × 10⁴J

Answer 1

Answer: (D)

2.33 × 10⁴J

Answer 2

dQ = $\int_{T_{1}}^{T_{2}}{nC_{v}dT}$ = 2.33 × 10⁴ J