Answer to Question #139313 in General Chemistry for Snaha Pokharel

Question

The combustion of 1.000 g of ethyl alcohol, C2H5OH(l), in O2(g), liberates 29.69 kJ of heat and yields CO2(g) and H2O(l). Write the thermochemical equation for the combustion of one mole of C2H5OH(l).

Answer 1

M(C₂H₅OH) = 46 g/mol

1g - 29.69 kJ

46g - 1366 kJ

C₂H₅OH_(l) + 3O_2(g) = 2CO_2(g) + 3H₂O_(l); $\Delta$ H = -1366 kJ/mol