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69 whenever organic matter is decomposed under oxygen-free(anaerobic) conditions, methane is one of the products. thus,enormous deposits of natural gas, which is almost entirelymethane, exist as a major source of fuel for home and industry.(a) it is estimated that known sources of natural gas can produce5600 ej of energy (1 ej  10 18 j). current total global energyusage is 4.0  10 2 ej per year. find the mass (in kg) of knownsources of natural gas (  h ° rxn for the combustion of ch 4  802 kj/mol)

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meerkat18
The solution is as follows:

The problem would only need the information of 5,600 EJ for the known sources of methane. The molar mass of methane is 16 g/mol.

802 kJ/mol(1000 J/ 1 kJ)(1 mol/16 g)(1000 g/1 kg)(x kg) = 5,600 EJ(10¹⁸ J/1 EJ)
Solving for x,
x = 1.18×10¹⁴ kg of natural gas or methane

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