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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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DentalWannabe DentalWannabe
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9 years ago
1) Using Hess's Law and any necessary information from your Data Booklet, calculate the molar enthalpy of reaction for the combustion of ethene in kJ/mol.
(I already know the answer for this one)
Answer: C2H4(g) + 3O2(g) ----> 2CO2(g) + 2H2O(g)
Heat of formation for Co2 and H2O
2(-393.5) + 2(-285.8) = -1358.6kJ

Hc[C2H4] + Hf[C2H5] = 2Hf[CO2} + 2Hf[H2O]
Hc[C2H4] -1411kJ = -1358.6kJ
Hc[C2H4] = 52.4kJ

Need help with 2 and 3!

2)Using your answer to Question 1, express the enthalpy of reaction as a molar enthalpy of reaction per mole of carbon dioxide produced in kJ/mol.

3)Express the reaction enthalpy by writing it as a term in the balanced chemical equation.
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bio_manbio_man
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9 years ago
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DentalWannabe Author
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#2
9 years ago
Thank you Thank you Thankk you!!
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#3
Educator
9 years ago
You're welcome, good luck.
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