sentence1: Molarmass Fe 55 g/mol & density 7.9 g/cm ^ 3 . It means that volume i.e. 55/7 .9 cm ^ 3 must contain 6.022 × 10 ^ 23 atoms.why does 22.4 L contain th8 no of atom ?
sentence2: How may i plugin Adsense on WordPress free hosted blog ?