One mole of ethanol (C2H6O) releases 327 kcal when burned, whereas one mole of hydrogen (H2) releases only 68.4 kcal/mol. How many kcal/g are released when each of these fuels is burned

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the answer is true. hope it .