Question

What mass of NO2 is formed by the complete reaction of 2 mol O3 with excess NO in the reaction?

O3 + NO --> O2 + NO2

I know the molar mass of O3 is 48 g/mol and NO2 46 g/mol

a) 23.0 g
b) 46.0 g
c) 92.0 g
d) 96.0 g

Answer 1

Use the coefficients to convert mols of what you have to mols of what you want.
2 mols O3 x (1 mol NO2/1 mol O3) = 2 x 1/1 = 2 mols NO2.
Now convert mols NO2 to grams. Grams = mols NO2 x molar mass NO2 = ?