Estimate the heat of formation of water dHf(H2O)(g) from its elements, provided the following bond energies. Write the equation.
H--H bond in H2 is 436kj/mol
O double bond O in O2 is 498kj/mol
H--O bond in water is 467kj/mol
a)-188kj/mol
b)-218kj/mol
c)-249kj/mol
d)-336kj/mol
e) -498kj/mol