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(ii) 2 C + 2 O --> 2 CO2 delta H2 = -393,5 kJ
(iii) H2 + 1/2 O2 --> H20. delta H3 = -286 kJ
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2C + H2 --> C2H2
H°f C2H2 = 2(-393,5) + (-286) = (-501) kJ