What is the answer?

Question

Given the following reaction:    4HCl(g) + 6NO(g)   5N2(g) + 6H2O(g)

How many grams of HCl are needed to completely react with 734.0g of nitrogen monoxide?

Answer 1

Hello, Leila,

Please use the table to follow my comments. The molar mass of NO is 30.0 g/mole (14 + 16). Divide that into the grams of NO to find moles NO (24.5 moles NO). The balanced equation tells us the ratio of moles HCl needed for moles NO produced (0.667). Multiply that ratio times the moles NO to find moles HCl required to completely react (16.3 moles HCl). Multiply the molar mass of HCl (36.5 g/mole) times the moles required to get grams HCl required (595.4 g HCl). The final answer is 4 sig figs.

Bob