How many grams of N2 are made from 32 grams of NH3 ?

Answer 1

2NH3--> N2+3H2

convert grams of NH3 to moles of NH3 with molar mass

mol = mass / molar mass

mass NH3 = 32g

molar mass NH3: 17.031 g NH3 = 1 mol NH3

convert mol NH3 to mol N2 with coefficients

by the coefficients, 2 mol NH3 = 1 mol N2

x mol NH3 × 1molN2/2molNH3 = mol N2

convert mol N2 to g N2 with molar mass

molar mass N2: 28.02 g N2 = 1 mol N2

grams = moles × molar mass