(Express your answer in terms of / H1)
A + B –> 2C, / H1
1/2 A + 1/2 B –> C, / H2 = ?
/ H2 = ________
A + 1/2 B –> C, / H1
2C –> 2A + B, / H2 = ?
/ H2 = ________
A –> B + 2C, / H1
1/2 B + C –> 1/2 A, / H2 = ?
/ H2 = ________
1 Answer

1.reaction is divided by 2…..so delta H2 = delta H1/2
2.reaction is multiplied by 2 …delta H = 2Xdelta H1 = 2delta H1
and then reversed …….sign of delta H will be reversed ……delta H = 2delta H1
so delta H2 = 2delta H1
3.reaction is divided by 2 ….delta H = delta H1/2
and then reversed ….delta H = delta H1/2
so delta H2 = delta H1/2