posted by =) .
Coal has about 2% sulfur. How many kilograms
of sulfur would be emitted from coalfired
power plants in the United States in 1 yr?
(U.S. electricity production is about 0.28 ×
1012 watts, and coal has an energy content of
about 30 × 106 J/kg. Note that 1 J = 1W-sec.)