How many grams of nitrogen are present in 2 moles of HNO3?

Given:

2 moles HNO3

Required:

Grams of nitrogen

Solution:

3HNO2 - > HNO3 + 2NO + H2O

Moles of N2 = (2 moles HNO3) (2 moles NO / 1 mole HNO3) = 4 Moles of NO

Molar mass of N2 = 28 g/mol

Mass of N2 = (4 Moles of NO) (1/2 mol N2/1 mol NO) (28g/mol)

Mass of N2 = 56g H2O