Calculate the number of moles of N2 gas present in 42.5 g of nitrogen. (At. wt. N = 14)

wt. of N2=42.5 g ; g. mol. wt. of N2 = 2×14=28 g. We know that: Number of moles ofN2=wt. of N2(g.) g.mol.wt.of N2mol−    =42.5g.28g.mol−=1.52mol