Hess' Law

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AP Chemistry › Hess' Law

Questions 1 - 5
1

Using the following data to calculate the enthalpy change in: C4H10O(l) -> C4H8 (g) + H2O (g)

01q

-76 kJ/mol

76 kJ/mol

152 kJ/mol

-152 kJ/mol

-17 kJ/mol

Explanation

01a

2

Using the following data to calculate the enthalpy change in: CaO (s) + H2O (l) -> Ca(OH)2 (aq)

02q

-124 kJ/mol

124 kJ/mol

-147 kJ/mol

147 kJ/mol

-62 kJ/mol

Explanation

02a

3

Using the following data to calculate the enthalpy change in: B2H6 (g) + 3 O2 (g) -> B2O3 (s) + 3 H2O (l)

03q

1084 kJ/mol

-1084 kJ/mol

2168 kJ/mol

-2168 kJ/mol

3252 kJ/mol

Explanation

03a

4

Using the following data to calculate the enthalpy change in: 3 NO2(g) + H2O (l) -> 2 HNO3 (aq) + NO (g)

04q

68.5 kJ/mol

-68.5 kJ/mol

137 kJ/mol

-137 kJ/mol

264 kJ/mol

Explanation

04a

5

Using the following data to calculate the enthalpy change in: 2 CH4 (g) + 3 O2-> 2 CO (g) + 4 H2O (l)

05q

214.2 kJ/mol

-214.2 kJ/mol

418.4 kJ/mol

-418.4 kJ/mol

-1214 kJ/mol

Explanation

05a

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