A student dissolves of three different ionic solids in separate calorimeters

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

Problem

A student dissolves

1.00\,\text{g}

of three different ionic solids in separate calorimeters, each containing

100.0\,\text{g}

of water initially at

25.0\,^\circ\text{C}

. The observed final temperatures are listed. • Salt A:

27.5\,^\circ\text{C}

• Salt B:

23.2\,^\circ\text{C}

• Salt C:

29.1\,^\circ\text{C}

Assuming no heat losses and that water has a specific heat capacity of

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

, which ranking orders the salts by the magnitude of heat exchanged per gram of salt, from greatest heat released to greatest heat absorbed? (a)

C > B > A

(b)

A > C > B

(c)

C > A > B

(d)

B > A > C