# Answered Essay: Given the following list of standard state formation reactions, rearrange the appropriate ones

Given the following list of standard state formation reactions, rearrange the appropriate ones in order to determ the ΔHo for the target reaction listed. Use only the equations that you need. Known Standard Enthalpy of Formation Reactions For Reference: C (graphite) + O2 (g) _ CO2 (g) AH”=-393.51 k/mol H, (g) + ½ O2 (g)-H2O (g) H, (g) + ½02 (g)-→ H2O (l) 2 C (graphite) 3 H2 (g) C2Hs () AH-84.68 kJmol 3 C (graphite) + 4 H2 (g)-→ C3H8 (g) AHPE-103.85 kirmol 4 C (graphite) + 5 H2 (g)-C,H10 (g) ah,o=-126.15 kimol AH,”=-241.8 kJ/mol AH -285.83 kJ/mol Target Reaction: C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (1) kJ/mol reaction

In the left we need 1 C3H8 (g) and right we need 3 CO2

take reaction no. 5 and reverse it

C3H8 → 3 C (graphite) + 4 H2   ΔH = 103.85kJ sign changes with reversal of reaction

from reaction 1.multiply by 3

3C (graphite) + 3O2 →  3 CO2   ΔH = -393.51 x 3 = -1180.53 kJ

from equation 3 we have:, multiply by 4

4H2(g) + 2 O2(g) → 4H2O (l)   ΔH = -285.83 x 4 = -1143.32 kJ

C3H8 (g) + 5 O2(g) → 3CO2(g) + 4H2O (l)

ΔHrxn = -1143.32 kJ + (-1180.53 kJ) + 103.85kJ

= -2220 kJ/mol reaction

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