Calculate the heat of hydrogenation of ethane 𝐶2𝐻4 using the following reactions:
2𝐶 (𝑔𝑟𝑎𝑝ℎ𝑖𝑡𝑒) + 3𝐻2 (𝑔) → 𝐶2𝐻6 (𝑔) ∆𝐻𝑓 = −84.5 𝑘𝐽/𝑚𝑜𝑙
2𝐶(𝑔𝑟𝑎𝑝ℎ𝑖𝑡𝑒) + 2𝐻2 (𝑔) → 𝐶2𝐻4 (𝑔) ∆𝐻𝑓 = 52.3 𝑘𝐽/mol
Reaction of heat of hydrogenation of ethane:
Now to form the main equation we have to subtract equation 2 from equation 1:
So heat of hydrogenation
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