Question

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Answer 1

Answer:

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

$Q=m\times c\times (T_2-T_1)$

$Q=50.0 g\times 2.0 J/g^oC\times (79^oC-90^oC)$

$Q=-1,100 J$

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.