When organic matter decomposes under oxygen-free (anaerobic) conditions, methane is one of the products. Thus, enormous deposits of natural gas, which is almost entirely methane, serve as a major source of fuel for home and industry.
(a) Known deposits of natural gas can produce 5600 EJ of energy (1 EJ = 10¹⁸ J). Current total global energy usage is 4.0X10² EJ per year. Find the mass (in kg) of known deposits of natural gas (ΔH°rxn for the combustion of CH₄ = -802 kJ/mol).