Answer to Question #194289 in General Chemistry for Jmae

Question #194289

Calculate the heat hydrogenation of ethane, C2H4 given the following thermochemical equations:

2C(graphite)+3 H2 (g)-----> C2H6 (g) ∆Hf= -84.5 kJ/mol

2C(graphite)+2 H2 (g)-----> C2H4 (g) ∆Hf= 52.3kJ/mol





1
Expert's answer
2021-05-18T07:52:15-0400

Ans:-Target Equation

"C_2H_4 + H_2 \\to C_2H_6"


"2C(graphite)+3 H_2 (g)\\to C_2H_6 (g) \u2206Hf= -84.5 kJ\/mol"................(i)

"2C(graphite)+2 H_2 (g)\\to C_2H_4 (g) \u2206Hf= 52.3kJ\/mol" ....................... (ii)


"\\therefore" To make main equation

"\\Rightarrow Eq^n(i)-Eq^n(ii)\\\\\n\\Rightarrow \\Delta H=\\Delta H_1-\\Delta H_2\\\\\n =-84.5-52.3\\\\\n=-136.8kJ\/mol"



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