Question

10.0 g of ammonium nitrate contains how many grams of nitrogen?

Answer 1

Molar mass of ammonium nitrate$(NH_4NO_3)=14+4+14+16\times 3=80\ gm$

Number of moles of ammonium nitrate in $10 \ gm=\frac{10}{80}=0.125$

Mass of nitrogen in one mole of ammonium nitrate$=14\times 2=28\ gm$

Mass of nitrogen in $0.125$ moles of ammonium nitrate$=0.125 \times 28=3.5 \ gm$