Question

tính phân tử khối của các phân tử sau

a.Br₂ (Brom)

b.Al₂ (SO₄)₃ (nhôm sunfat)

c.Mg (OH₂)(magie hidroxit)

d.H₃PO₄ (axitphotphoric)

e. Al₂O₃(Nhôm oxit)

Answer 1

a, PTK\(_{Br_2}\) = 2.80 = 160 (ĐvC )

b, PTK\(_{Al_2\left(SO_4\right)_3}\)= 2.27+3.32+12.16= 342 (ĐvC )

c, PTK\(_{Mg\left(OH\right)_2}\) = 24 + 2.16+ 2 = 58 ( ĐvC )

d, PTK\(_{H_3PO_4}\)= 3 + 31+4.16 = 98(ĐvC)

e,PTK\(_{Al_2O_3}\) = 2.27+3.16 = 102 (ĐvC )

Answer 2

a) \(PTK_{Br_2}=2\cdot80=160\left(đvC\right)\)

b) \(PTK_{Al_2\left(SO_4\right)_3}=2\cdot27+3\cdot\left(32+4\cdot16\right)=342\left(đvC\right)\)

c) \(PTK_{Mg\left(OH\right)_2}=24+2\cdot\left(16+1\right)=58\left(đvC\right)\)

d) \(PTK_{H_3PO_4}=3\cdot1+31+4\cdot16=98\left(đvC\right)\)

e ) \(PTK_{Al_2O_3}=2\cdot27+3\cdot16=102\left(đvC\right)\)