For each of the following, determine the value of Delta H2 in terms of Delta H1?

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(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

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