tentukan massa molekul relatif garam berikut MgSO4 . 7H2O Mohon bantuannya

Ar H = 1; O = 16; Mr H2O = 18
Ar S = 32; Mg = 24
Mr MgSO4 . 7H2O = Ar Mg + Ar S + 4(Ar O) + Mr H2O
= 24 + 32 + 4(16) + 7(18)
= 246 g/mol