Answer to Question #122325 in General Chemistry for mabsoor

Question

if you were attempt to make 45 g of methane from CO2 and H2O (with O2 is also being produced), how much heat would be absorbed during the reaction?

Answer 1

 methane from CO2 and H2O (with O2 is also being produced), are the revese of combustion of methane.

Heat of combustion of methane is -891 kj/mol ;

so, in this reaction heat absorb is +891 kj/mol

for 16 gm of methane absorb heat is +891kj/mol

so, for 45 gm heat absorb is 2505.9375 kj. answer.