Question: Please answer parts A and B given that: The fuel in high-efficiency na

Question

Question:

Please answer parts A and B given that:

The fuel in high-efficiency natural gas vehicles consists primarily of methane CH4

Part A How much heat is produced in burning 2 mol of CH4 under standard condition if reactants and products are brought to 298 K and H2O(l) is formed? Express your answer using four significant figures. Part B What is the maximum amount of useful work that can be accomplished under standard conditions by this system? Express your answer using four significant figures.

Explanation / Answer

CH4(g) + 2 O2(g)   ? CO2(g) + 2 H2O (l)

?Hocombustion = 2 ?Hof,water + ?Hof,carbon dioxide - ?Hof,methane - 2 ?Hof,oxygen

?Hof,water(l) = -285.8 kJ mol-1,    but ?Hof,water(gas) = - 241 kJ mol-1

?Hof,carbon dioxide  = -393.5 kJ mol-1

?Hof,oxygen = 0.0 kJ mol-1

?Hof,methane = ?74.87 kJ/mol

?Hocombustion = -890 kJ/mol          

( in literature:   

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