How much heat is needed to raise the temperature of 2.0 mol of an ideal gas by 10 K at constant pressure (Cp = 29.1 J mol⁻¹ K⁻¹)?
Correct answer D. 5.8 × 10² J
Explanation
Q = nCpΔT = 2.0 × 29.1 × 10 = 582 J ≈ 5.8 × 10² J. Using Cv = 20.8 J mol⁻¹ K⁻¹ instead gives the constant-volume value 4.2 × 10² J.
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