Problem 4: In 1989, 0.39 x 1012 g of particulates were released when 685 million tons (each ton is 2000 lb) of coal were burned in power plants that produced

1,400 billion kWh of electricity.Assume that the average heat content of the coal is 10,000 Btu/lb. What must have been the average efficiency (heat to electricity) of these coal plants? How much particulate matter would have been released if all of the plants met the New Source Performance Standards that limit particulate emissions to 0.03 lb per 10° Btu of heat?