Hess’s Law

Question 1: Use the Δ_fH° information provided to calculate Δ_rH° for the following: SO₂Cl₂ (g) + 2H₂O(l)→ 2HCl(g) + H₂SO4(l) Δ_rH°= ?
Δ_fH°(kJ/mol)
SO₂Cl₂(g) -364
H₂O(l) -286
HCl(g) 92
H₂SO₄(l) -814

-422 kJ/mol
+161 kJ/mol
+800. kJ/mol
-62 kJ/mol
-256 kJ/mol

Question 2: Use the Δ_fH° and Δ_rH° information provided to calculate Δ_fH° for IF:
IF₇(g) + I₂(g) → IF₅(g) + 2IF(g) Δ_r H°= -89 kJ
Δ_fH°(kJ mol)
IF₇(g) -941
IF₅(g) -840

-95 kJ/mol
101 kJ/mol
-190. kJ/mol
24 kJ/mol
-146 kJ/mol

Question 3: Use the information provided to determine Δ_rH° for the following reaction:
Δ_fH°(kJ/mol) CH₄(g) + 4 Cl₂(g) → CCl₄(g) + 4 HCl(g) Δ_rH°= ?
CH₄(g) -75
CCl₄(g) -96
HCl(g) -92

-71 kJ/mol
-113 kJ/mol
+113 kJ/mol
-389 kJ/mol
+79 kJ/mol

Question 4: Use the information provided to determine Δ_rH° for the following reaction:
CH₄(g) + 3Cl₂(g) → CHCl₃(l) + 3HCl(g) H°= ?
Δ_fH° (kJ mol^-1)
CH₄(g) -75
CHCl₃(l) -134
HCl(g) -92

-151 kJ/mol
+662 kJ/mol
+117 kJ/mol
-335 kJ/mol
-217 kJ/mol

Question 5: Use the Δ_fH° and Δ_rH°information provided to calculate Δ_fH° for SO₃(g):
Δ_fH°(kJ mol^-1) 2SO₂(g) + O₂(g) → 2SO₃(g) Δ_rH°= -198 kJ
SO₂(g) -297

-248 kJ/mol
-578 kJ/mol
-396 kJ/mol
-792 kJ/mol
-495 kJ/mol

ALCO Admin Main August 19, 2021

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