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Enthalpy of Formation

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Please help with the following problem.

Many power plants produce energy by burning carbon-based fuels, which also produces carbon dioxide. Carbon dioxide is a greenhouse gas, so over-production can have negative effects on the environment.
Use enthalpy of formation data to calculate the number of moles of CO_2 (g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1 atm and 25 °C).
(a) coal, C(s, graphite);
__________ mol · MJ -1
(b) natural gas, CH4(g);
__________ mol · MJ -1
(c) propane, C3H8(g);
__________ mol · MJ -1
(d) octain, C_8 H_18 (l) (∆H_f°= -250.1 kj ·mole^(-1) ).
__________ mol · MJ -1

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This solution helps with problem regarding enthalpy of formation. Step by step calculations are given for each problem.

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a. C + O2 → CO2 ΔHf
= -393.5 kJ /mol
1MJ = 106
J
Number of moles = 106
J /393.5 x103
J =2.5
b. CH4 + 2O2 → CO2 + 2 H2O
ΔHrxn = [ΔHf (CO2) + 2 ΔHf (H2O)] - [ΔHf (CH4)+ 2 ΔHf (O2)]
Using standard values
ΔHrxn = ...

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