Question

Consider the following reaction. 2Fe2O3 --> 4Fe + 3O2 deltaH = +824.2KJ The formation of 42.0 g of O2 results in? 1) the absorption of 361 kJ of heat. 2) the absorption of 11500 kJ of heat. 3) the absorption of 1080 kJ of heat.

Answer 1

convert the mass of \(O_2\) to moles and divide the value you get by the stoichiometric coefficient (for \(O_2\)) in the reaction - which is 3 here.

Next multiply by \(\Delta H\)