Question

CHEM CLASS 9
plz ans it fast..

Answer 1

1 mole of magnesium chloride, MgCl2 = 24 + (2 × 35.5) = 95 g

i.e. 95 g of MgCl2 contains 6.023 × 1023 MgCl2 molecules

∴ 0.51 g MgCl2 contains = (6.023 × 1023 × 0.51)/95 = 3.01 × 1021 MgCl2 molecules.

Hence, 0.51 g MgCl2 contains = 3.01 × 1021 Mg+2 ions.