Question

Hitung mr dari Mg(OH)2 pake caara ya :)

Answer 1

Ar Mg = 24
ar O = 16
ar H = 1

mr Mg(OH)2 = ...?
= ( 1 × ar Mg) +( 2 × ar O) + (2 × ar H)
= (1 × 24) + (2 × 16) + (2 × 1)
= 24 + 32 + 2
= 58 gr/mol

Answer 2

Dari tabel periodik didapat data:
Ar Mg = 24
Ar O = 16
Ar H = 1

Mr Mg(OH)₂ = Ar Mg + (2 x Ar O) + (2 x Ar H)
Mr Mg(OH)₂ = 24 + (2 x 16) + (2 x 1) 
Mr Mg(OH)₂ = 58