5. Calculate delta Hrxn for the reaction between methane gas and chlorine gas th

Question

5. Calculate delta Hrxn for the reaction between methane gas and chlorine gas that produces carbon tetrachloride gas and hydrogen chloride gas. Use the following reactions and givens Delta H?s. Reaction #1: Solid carbon reacts with hydrogen gas to produce methane gas with a delta H=-74.6 k. Reaction #2: Solid carbon reacts with chlorine gas to produce carbon tetrachloride gas with a delta H = -95.7 kJ. Reaction #3: Hydrogen gas reacts with chlorine gas to produce hydrogen chloride gas with a delta H =-92.3 kJ

Explanation / Answer

C (s) + 2 H2(g) ------------------------. CH4 (g)    DH=-74.6Kj

C (s) + 2 Cl2(g) ------------------------. CCl4 (g)    DH=-95.7Kj

H2(g) + Cl2 (g) -----------------------> 2 HCl (g)   DH= -92.3KJ

   CH4 (g) ---------------------------> C (s) + 2 H2(g)    DH= +74.6Kj

C (s) + 2 Cl2(g) ------------------------. CCl4 (g)    DH=-95.7Kj

2 H2(g) + 2 Cl2 (g) -----------------------> 4 HCl (g) ) DH= -184.6KJ

BYADDING THE ABOVE EQUATIONS ,WE GET

CH4(g) + 4 Cl2 (g) ---------------------------------->   CCl4(g) + 4 HCl(g) : DH= -205.7 KJ

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