A 12.5-g sample of an unknown metal is heated from 25 °C to 100 °C

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

A 12.5-g sample of an unknown metal is heated from 25 °C to 100 °C, requiring 2.15 kJ of energy. The metal’s molar mass is 55.9 g mol⁻¹. What is the molar heat capacity of the metal in J mol⁻¹ K⁻¹? (a) 9.62×101 J mol−1K−19.62\times10^{1}\ \text{J mol}^{-1}\text{K}^{-1} (b) 1.28×102 J mol−1K−11.28 \times 10^{2}\ \text{J mol}^{-1}\text{K}^{-1} (c) 6.41 J mol−1K−16.41\ \text{J mol}^{-1}\text{K}^{-1} (d) 2.29 J mol−1K−12.29\ \text{J mol}^{-1}\text{K}^{-1}

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