Answer to Question #192947 in General Chemistry for sdoog23

Question #192947

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


1
Expert's answer
2021-05-14T02:34:40-0400

Reaction of heat of hydrogenation of ethane:


"C_2H_4+H_2\\Rightarrow C_2H_6"

Given that:

Equation .1.

"2C+3H_2\\Rightarrow C_2H_6:\\Delta H_1=-84.5KJ\/mol"


Equation .2.

"2C+2H_2\\Rightarrow C_2H_4:\\Delta H_2=" "52.3KJ\/mol"


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


So heat of hydrogenation"=" "\\Delta H_1-\\Delta H_2"

"=-84.5-52.3=-136.8KJ\/mol"


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Comments

Assignment Expert
21.06.21, 13:53

Dear Stephany,

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Stephany
21.06.21, 12:12

Thank you for the answer it helps of me

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