tolong bantuanya ya. tugas liburan.

Mapel: Kimia
Kelas: X
Materi; Stoikiometri
kata kunci: Massa Mol dan jumlah partikel

Jawab

9. Mr CO(NH2)2 = 60g/mol
n= gr/Mr
n= 180/60
n= 3mol

10. Ne = 3,32×10²³

Ar= massa unsur rata-rata/ 1/12 × massa 1atom karbon -12

Ar = 3,32×10-²³ / 1/12 × 2,0×10-²³
Ar = 3,32×12/2,0
Ar = 19,92
Ar = 20

Thanks