It is estimated that the day Mt. St. Helens erupted (May 18,1980 ), about $4.0 \times 10^{5}$ tons of $\mathrm{SO}_{2}$ were released into the atmosphere. If all the $\mathrm{SO}_{2}$ were eventually converted to sulfuric acid, how many tons of $\mathrm{H}_{2} \mathrm{SO}_{4}$ were produced?