Сделай задание по химии 9 класс

\[ \begin{aligned} M_r(\mathrm{H_2O})&=2\cdot1+16=18;\\ M_r(\mathrm{CaCO_3})&=40+12+3\cdot16=100;\\ M_r(\mathrm{H_2SO_4})&=2\cdot1+32+4\cdot16=98;\\ M_r(\mathrm{Na_2CO_3})&=2\cdot23+12+3\cdot16=106;\\ M_r(\mathrm{KMnO_4})&=39+55+4\cdot16=158;\\ M_r(\mathrm{P_2O_5})&=2\cdot31+5\cdot16=142;\\ M_r(\mathrm{NaOH})&=23+16+1=40;\\ M_r(\mathrm{Zn_3(PO_4)_2})&=3\cdot65+2(31+4\cdot16)=385;\\ M_r(\mathrm{H_3PO_4})&=3\cdot1+31+4\cdot16=98;\\ M_r(\mathrm{Al_2O_3})&=2\cdot27+3\cdot16=102;\\ M_r(\mathrm{Al(OH)_3})&=27+3(16+1)=78;\\ M_r(\mathrm{Mg(OH)_2})&=24+2(16+1)=58. \end{aligned} \]