Answer:
The answer is-2168kj/mol
Explanation:
Formula is product-reactant
Product is B2O3+3H2O
B2O3=-1274kj/mol
3H2O=3(-286)=-858kj/mol
Reactant is B2H6
B2H6=36kj/mol
Product-reactant=-858-1274-36
=-2168kj/mol
first you subtract then you divide the equation an the you get your ansewe
