One kilogram of high-grade coal produces about 2.8 × 10⁴ kJ energy when it is burned. Fission of 1 mol ²³⁵U releases 1.9 × 10¹⁰ kJ.

(a) Calculate the number of metric tons (1 metric ton = 1000 kg) of coal needed to produce the same amount of energy as the fission of 1 kg uranium.

(b) How many metric tons of sulfur dioxide (a major source of acid rain) are produced from the burning of the coal in part a, if the coal is 0.90% by mass sulfur?