# Module 2: Born Haber Cycles - chemhume.co.uk

Module 2: Born Haber Cycles Find the standard enthalpy of formation of ethane. Given the following enthalpies of combustion; C(s) = -393 KJ mol-1 H2(g) = -286 KJ mol-1 C2H6(g) = -1560 KJ mol-1 Step 1: Write equations for the data provided C(s) +

O2 CO2(g) H2(g) + O2(g) H2O(l)

2CO2(g) + 3H2O(l) C2H6(g) + 7/2 O2 Step 2: Write an equation for what you want to find. 2C(s) + 3H2(g) C2H6(g)

Start your cycle with the left hand side of this equation. Step 3: The Cycle 2C(s)+ 3H2(g) 2Hc[C] 2CO2(g) + 3H2(g) 3Hc[H2] 2CO2(g)

+ 3H2O(l) Hf[C2H6] C2H6(g) Hc[C2H6] Step 4: Calculation Hf[C2H6(g)] = 2(-393) + 3(-286) + (1560) = -84 KJ mol-1

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