560 words - 3 pages

Hess’s Law Extra WS Name:

(1) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:

2 CO2(g) + H2O(g) → C 2H2(g) + 5/2 O2(g)

C2H2(g) + 2H2(g) → C2H6(g) ΔH = –94.5 kJ H2O(g) → H2(g) + ½ O2 (g) ΔH =71.2 kJ C2H6(g) + 7/2 O2(g) → 2 CO2(g) + 3 H2O(g) ΔH = –283 kJ

(2) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: H2SO4(l) → SO3(g) + H2O(g)

H2S(g) + 2 O2(g) → H2SO4(l) ΔH = –235.5 kJ H2S(g) + 2 O2(g) → SO3(g) + H2O(l) ΔH = –207 kJ H2O(l) → H2O(g) ΔH = 44 kJ

(3) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: N2(g) + 2 O2(g) → 2 NO 2(g)

N2(g) + 3H2(g) → 2 NH3(g) ΔH = –115 kJ

2 NH3(g) + 4 H2O(l) → 2 NO2(g) + 7 H2(g) ΔH = –142.5 kJ H2O(l) → H2(g) + ½ O 2(g) ΔH = –43.7 kJ

(4) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: CO2(g) → C(s) + O2(g)

H2O(l) → H2(g) + ½ O2(g) ΔH = 643 kJ C2H6(g) → 2 C(s) + 3 H 2(g) ΔH = 190.6 kJ

2 CO2(g) + 3 H2O(l) → C 2H6(g) + 7/2 O2(g) ΔH = 3511.1 kJ

(5) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: N2H4(l) + CH4O(l) → CH2O(g) + N2(g) + 3H2 (g)

2 NH3(g) → N2H4(l) + H2(g) ΔH = 22.5 kJ

2 NH3(g) → N2(g) + 3 H 2(g) ΔH...

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