Problem: The complete combustion of ethanol, C2H5OH (FW = 46.0 g/mol), proceeds as follows: C2H5OH(l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O(l) ΔH = − 555 kJ What is the enthalpy change for combustion of 15.0 g of ethanol?a) -12.1 kJb) -181 kJc) -422 kJd) -555 kJe) -1700 kJ

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ΔH = -555 kJ/1 mol CH3OH


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The complete combustion of ethanol, C2H5OH (FW = 46.0 g/mol), proceeds as follows: 

C2H5OH(l) + 3 O2 (g) → 2 CO(g) + 3 H2O(l) ΔH = − 555 kJ 

What is the enthalpy change for combustion of 15.0 g of ethanol?


a) -12.1 kJ

b) -181 kJ

c) -422 kJ

d) -555 kJ

e) -1700 kJ

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