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Mercury (Hg) is present in trace amounts in coal, ranging from 50.0 to 200.0 ppb. A typical power plant burns 2.39 million tons of coal
per year. Calculate tons of mercury in the coal based on the lower (50.0 ppb) and higher (200.0 ppb) concentrations.

Mercury at 50.0 ppb= __ tons Hg
Mercury at 200.0 ppb= __ tons Hg