Calculate the total heat (in J) associated with the conversion of 10.0 g of gaseous ethanol
(C2H5OH) at 78.5°C and 1 atm to liquid ethanol at 78.5°C and 1 atm.
1
Expert's answer
2019-03-18T08:32:52-0400
Tboiling at 1 atm = 78.50C
ΔH0vap = 40.5 kJ/mol
Q = n*ΔH0vap
n(C2H5OH) = 10.0 g/46.07 g/mol = 0.217 mol
Q = 0.217 mol * 40.5 kJ/mol = 8.791kJ = 8791 J
Q should be negative since the ethanol gives up energy
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