Answer to Question #96557 in General Chemistry for jake

Question

Ethanol (the alcohol used in "potent potables") undergoes a combustion reaction with the following stoichiometry:

C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (l) ΔrH = -1371 kJ/mol

What is the total heat absorbed by the surroundings (in kJ) when 25.3 g of ethanol combusts in the presence of excess oxygen at constant pressure?

Answer 1

C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (l) ΔrH = -1371 kJ/mol 

25.3/46 x 1371= 754.05 kJ.