Practice question
Question
A system absorbs 800 J of heat at constant volume, and its temperature rises by 10 K. If Cv = 20 J/mol·K, how many moles are present?
Explanation
At constant volume, Δ U = qv = nCvΔ T. So, 800 = n × 20 × 10, n = 800 / 200 = 4 mol.
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