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"
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