4HN3 + 5 O2 = 4NO + 6 H20.

Question

How many grams of O2 are required to produce 90 grams of NO?

Answer 1

Step 1.
Convert 90 g NO to mols. #mol = g/molar mass.

Step 2.
Convert mols NO to mol O2 using the coefficients in the balanced equation.

Step 3. Convert mols O2 to grams O2. grams = # mols O2 x molar mass O2.

Post your work if you get stuck.