Question

Thermodynamic PropertiesProperty Value

Answer 1

Answer:

1,620 J.

Explanation:

• The amount of heat added to a substance (Q) can be calculated from the relation:

Q = m.c.ΔT.

where, Q is the amount of heat released from ethanol cooling,

m is the mass of ethanol (m = 60.0 g),

c is the specific heat of ethanol in the liquid phase, since the T is cooled below the boiling point and above the melting point (c = 1.0 J/g °C),

ΔT is the temperature difference (final T - initial T) (ΔT = 43.0 °C – 70.0 °C = - 27.0 °C).

∴ Q = m.c.ΔT = (60.0 g)(1.0 J/g °C)(- 27.0 °C) = - 1620 J.

The system releases 1620 J.