Answer to Question #207994 in General Chemistry for ARKHYE

Question #207994

1. Calculate the heat of hydrogenation of ethane (C2H6) given the following thermochemical equations:

a. 2 C (graphite) + 3 H2 (g) 👺 C2H6 (g)      Ξ”Hfo = - 84.5 kJ/mol

b. 2 C (graphite) + 2 H2 (g) 👺 C2H4 (g)      Ξ”Hfo =   52.3 kJ/mol


1
Expert's answer
2021-06-18T07:20:07-0400

Reaction of heat of hydrogenation of ethane:


C2H4+H2β‡’C2H6C_2H_4+H_2\Rightarrow C_2H_6

Given that:

Equation .1.

2C+3H2β‡’C2H6:Ξ”H1=βˆ’84.5KJ/mol2C+3H_2\Rightarrow C_2H_6:\Delta H_1=-84.5KJ/mol


Equation .2.

2C+2H2β‡’C2H4:Ξ”H2=2C+2H_2\Rightarrow C_2H_4:\Delta H_2= 52.3KJ/mol52.3KJ/mol


Now to form the main equation we have to subtract equation 2 from equation 1:


So heat of hydrogenation== Ξ”H1βˆ’Ξ”H2\Delta H_1-\Delta H_2

=βˆ’84.5βˆ’52.3=βˆ’136.8KJ/mol=-84.5-52.3=-136.8KJ/mol

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