Đáp án:

 1) CT: PH3; PTK= 34đvC

2)CT: SO2 ; PTK= 64đvC

3) CT: Mg(OH)2; PTK= 58đvC

4) HNO3(axit nitric): PTK= 63đvC

5) Fe(OH)3; PTK= 107đvC

6) CuSO4; PTK= 160đvC

7) AlCl3; PTK= 133,5 đvC

8) CO2; PTK= 44 đvC

9) Al2(SO4)3; PTK= 342đvC

10) ClO2; PTK= 51,5đvC

Giải thích các bước giải:

 Như thế này dễ hỉu mà

Bạn tham khảo:

\begin{array}{|c|c|c|}\hline \text{STT}&\text{Hoá trị của thành phần A}&\text{Hoá trị của thành phần B}&\text{Công thức}A_xB_y&\text{Phân tử khôi}\\\hline \text{1}&\text{P(III)}&\text{H}&{PH_3}&\text{34}\\\hline \text{2}&\text{S(VI)}&\text{O}&{SO_3}&\text{80}\\\hline \text{3}&\text{Mg(II)}&\text{OH(I)}&{Mg(OH)_2}&\text{58}\\\hline \text{4}&\text{H}&{NO_3(I)}&{HNO_3}&\text{63}\\\hline\text{5}&\text{Fe(III)}&\text{OH(I)}&{Fe(OH)_3}&\text{107}\\\hline\text{6}&\text{Cu(II)}&{SO_4(II)}&\text{CuSO_4}&\text{160}\\\hline\text{7}&\text{Al(III)}&\text{Cl(I)}&{AlCl_3}&\text{133,5}\\\hline\text{8}&\text{C(IV)}&\text{O}&{CO_2}&{44}\\\hline\text{9}&\text{Al(III)}&{SO_4(II)}&{Al_2(SO_4)_3}&\text{342}\\\hline\text{10}&\text{Cl(VII)}&\text{O}&{Cl_2O_7}&\text{183}\\\hline\end{array}