Answer:
8 grams
Step-by-step explanation:
To produce 4 grams of HNO3, 8 grams of NO2 are required. The balanced chemical equation for the reaction between NO2 and H2O to form HNO3 is:
4NO2(g) + 6H2O(l) -> 4HNO3(aq) + 4NO(g)
So, for every 4 grams of NO2, 4 grams of HNO3 are produced. Hence, 8 grams of NO2 are required to produce 4 grams of HNO3.
ALLEN