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

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