massa atom relatif Na = 23, O-16, dan S=32. Tentukan massa molekul relatif senyawa Na²SO⁴?

Mapel: Kimia
Kelas: X
Materi: Stoikiometri
Kata Kunci: Massa Mr

Jawab

Mr Na2SO4
Mr (2× Ar N ) + ( Ar S ) + ( 4 × Ar O )
Mr ( 2× 23) + (32) + (4×16)
Mr ( 46 ) + (32) + (64)
Mr → 142g/mol

Stoikiometri
Kelas 10

Penulisannya [tex] Na_2 SO_4[/tex] ya kk

Ar Na = 23
Ar O = 16
Ar S = 32

Mr [tex] Na_2 SO_4[/tex]
= 2 x Ar Na + Ar S + 4 x Ar O
= 2 x 23 + 32 + 4 x 16
= 46 + 32 + 64
= 142 gr/mol