A new coal-fired power plant has been built using a sulfur emission control system that is 70.% efficient. If all of the sulfur oxidizes to SO2 and the emissions of SO2 are limited to 0.60 lb SO2 per million BTU of heat into the power plant, what maximum percent sulfur content can the fuel have if (a) 15,000. BTU/lb coal is burned; or if (b) 9000. BTU/lb coal is burned.
