A sample of graphite is heated from to and then allowed to cool to

CHEMISTRY · Single correct · AP · Chemistry · Thermochemistry · Thermochemistry

Problem

60\,\text{g}

sample of graphite is heated from

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

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

and then allowed to cool to

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

. The specific heat capacity of graphite is

0.71\,\text{J}\,\text{g}^{-1}\,^{\circ}\text{C}^{-1}

between

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

and

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

and

0.85\,\text{J}\,\text{g}^{-1}\,^{\circ}\text{C}^{-1}

between

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

and

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

. What is the net heat absorbed or released by the graphite over the entire process? (a)

+1.28\times10^{3}\,\text{J}

(net absorption) (b)

+1.06\times10^{3}\,\text{J}

(net absorption) (c)

-1.06\times10^{3}\,\text{J}

(net release) (d)

+8.30\times10^{3}\,\text{J}

(net absorption)