During an experiment

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

Problem

During an experiment, a

28.0\,\text{g}

piece of unknown metal at

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

is placed in a coffee-cup calorimeter containing

110.0\,\text{g}

of water at

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

. The calorimeter itself absorbs heat according to a heat capacity of

18.5\,\text{J}\,^{\circ}\text{C}^{-1}

. When equilibrium is reached, the temperature is

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

. If the metal’s molar mass is

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

, determine its molar heat capacity in

\text{J}\,\text{mol}^{-1}\,^{\circ}\text{C}^{-1}