Some thermodynamic properties of ethanol are listed in the table.

Thermodynamic Properties
Property Value
c (solid) 0.5 J/g °C
c (liquid) 1.0 J/g °C
c (gas) 2.0 J/g °C
Melting Point −114 °C
Boiling Point 78 °C

How much heat is released when 50.0 g of ethanol cools from 90 °C to 79 °C?
1,200 J
1,100 J
600 J
550 J

1,100 Joules of heat is released when 50.0 g of ethanol cools from 90 °C to 79 °C.

Explanation:

Mass of an ethanol = 50.0 g

Specific heat capacity of the ethanol vapor's = c = 2.0 J/g°C

Initial temperature of the ethanol vapors = 90 °C

Final temperature of the ethanol vapors = 79°C

Heat released on cooling of ethanol vapors = Q

Negative sign indicates that the heat is released into the surroundings.

1,100 Joules of heat is released when 50.0 g of ethanol cools from 90 °C to 79 °C.

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