The molecular formula of aluminium chloride is AlCl3 . calculate its molecular mass.

Explanation

Displacement reactions: In a displacement reaction, a more active element displaces or removes another element from its compound. e.g.
`Zn(s) + CuSO_4(aq) rarr ZnSO_4(aq) + Cu(s)`
`Pb(s) + CuSO_4(aq) rarr PbSO_4(aq) + Cu(s)`
Zinc and lead being more active metals displace the lesser active metal, copper from copper sulphate solution.
Double displacement reactions : In a double displacement reaction, two different atoms or groups of atoms (ions) are displaced by other `"atoms"//"groups"` of atoms. For example, `BaCl_2(aq) + Na_2SO_4(aq) rarr BaSO_4(s) + 2NaCl (aq)`
Here, `SO_4^(2-)` ions displace `Cl^(-)` ions and `Cl^(-)` ions displace `SO_4^(2-)` ions.