1/
- Đơn chất: Br2, Zn, N2
- Hợp chất: AlCl3, MgO, KNO3, NaOH, C4H10
2/
- CTHH: P2O5 ;PTK = 31.2+16.5 = 142 (đvC)
- CTHH: Al2(SO4)3 ;PTK = 27.2 + (32+4.16).3 = 342 (đvC)
- CTHH: Fe(NO3)3 ;PTK = 56+(14+16.3).3 = 242 (đvC)
- CTHH: H3PO4 ;PTK = 1.3+31+16.4 = 98 (đvC)
- CTHH: Cu(OH)2 ;PTK = 64+(16+1).2 = 98 (đvC)