Answer:
1.8 *10^13 g of NO2
Step-by-step explanation:
if 1 short ton of NO2 = 2000Ib OF NO2
20 million short tons of NO2 = 20 * 10^ 6 * 2 * 10^3/1
= 40 * 10^9 Ib
If 1 pound (lb) = 453.59237 grams (g).
40 * 10^9 Ib =40 * 10^9 * 453.59237/1
= 1.8 *10^13 g of NO2