A sample of an unknown metal (molar heat capacity ; molar mass ) cools from to

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

45.0\,\text{g}

sample of an unknown metal (molar heat capacity

C_m = 28.4 \,\text{J mol}^{-1}\,\text{K}^{-1}

; molar mass

56.1 \,\text{g mol}^{-1}

) cools from

97.0\,^{\circ}\text{C}

23.0\,^{\circ}\text{C}

. Determine the heat released by the metal, reporting your answer in kilocalories.