Homework Answers
Calculate the mass of water.
Because the density of water = 1 g/ml
Since one liter of water has a mass of 1 kg
and the mass of 1,000,000 liters of water is mw = 1,000,000 kg.
Calculate the mass of ethanol.
Because the density of ethanol = 0.789 g/ml
Since one liter of ethanol has a mass of .789 kg
and the mass of 1,000,000 liters of ethanol is mw = 789,000 kg.
ΔT = 10oC
The heat transferred to the water using the specific heat of water is
Qw = mwcwΔT = (1,000,000 kg)(4186 J/kgºC)(10.0ºC) = 41.8 kJ.
The heat transferred to the ethanol using the specific heat of ethanol is
Qw = mwcwΔT = (789,000 kg)(2460 J/kgºC)(10.0ºC) = 19.4 kJ.
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