The hydrogen-filled dirigible Hindenburg had a volume of 1.9910^8L.

The hydrogen-filled dirigible Hindenburg had a volume of 1.99×10^8L.
Part A
If the hydrogen used was produced by the reaction of carbon with steam, how many kilograms of carbon would have been needed to produce enough hydrogen to fill the dirigible at 29 ∘C and 750 mm Hg pressure? C(s)+H2O(g)→CO(g)+H2(g)
answer in kg