# Hess Review With Answers - Riverview High School Assignment

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 = 57.5 kJ CH2O(g) + H2(g) → CH 4O(l) ΔH = 81.2 kJ
(6) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:
½ H2(g) + ½ Cl2(g) → HCl(g)
COCl2(g) + H2O(l) → CH2Cl2(l) + O2(g) ΔH = 47.5 kJ
2 HCl(g) + ½ O2(g) → H 2O(l) + Cl2(g) ΔH = 105 kJ CH2Cl2(l) + H2(g) + 3/2 O 2(g) → COCl2(g) + 2 H 2O(l) ΔH = –402.5 kJ
(7) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:
C2H2(g) + 5/2 O2(g) → 2CO2(g) + H2O(g)
C2H6(g) → C2H 2(g) + 2 H2(g) ΔH = 283.5 kJ H2(g) + ½ O2(g) → H2O(g) ΔH = –213.7 kJ
2 CO2(g) + 3 H2O(g) → C2H6(g) + 7/2 O2(g) ΔH = 849 kJ
(8) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: HCl(g) + NaNO2(s) → HNO2(l) + NaCl(s)
2 NaCl(s) + H2O(l) → 2 HCl(g) + Na2O(s) ΔH = 507 kJ NO(g) + NO2(g) + Na2O(s) → 2 NaNO2(s) ΔH = –427 kJ NO(g) + NO2(g) → N2O(g) + O2(g) ΔH = –43 kJ
2 HNO2(l) → N2O(g) + O2(g) + H 2O(l) ΔH = 34 kJ
(9) Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: Zn(s) + ⅛ S8(s) + 2O2(g) → ZnSO4(s)
Zn(s) + 1/8 S8(s) → ZnS(s) ΔH = –183.92 kJ
2 ZnS(s) + 3 O2(g) → 2ZnO(s) + 2 SO2(g) ΔH = –927.54 kJ
2 SO2(g) + O2(g)

2 SO3(g)
ΔH = –196.04 kJ
ZnO(s) + SO3(g)

ZnSO4 (s)
ΔH = –230.32 kJ
2 Hess’s Law Extra Worksheet

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