The United States emitted 19.5 millions of nitrogen oxides (no) into the atmosphere in 1987. One metric ton equals 1,000 kg. How many kilograms of No were emitted to the atmoshere in the United Stated during 1987?
suspect you mean 19.5 *10^6 TONS
19.5*10^6 tons * (10^3 kg/ton) = 19.5*10^9 kg
or 19.5 billion kg