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2. Use the enthalphy of formation given below to calculate the enthalphy change for these reactions. i) C6H6(l)6C(s)+3H2(g) H= ? ii) C2H4(g)+HCl(g)C2H3Cl(g) H=? (3 marks)

2. Use the enthalphy of formation given below to calculate the enthalphy change for these reactions. i) C6H6(l)6C(s)+3H2(g) H= ? ii) C2H4(g)+HCl(g)C2H3Cl(g) H=? (3 marks) (2 marks)

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