Đáp án:
Giải thích các bước giải:
`+Ca_3(PO_4)_2:`
`PTK=40.3+2(31+16.4)=310(dvC)`
`3Ca,2P,8O`
`+Cu(NO_3)_2:`
`PTK=64+2(14+16.3)=188(dvC)`
`1Cu,2N,6O`
`+AlCl_3:`
`PTK=27+35,5.3=133,5(dvC)`
`1Al,3Cl`
`+Fe_2(SO_4)_3:`
`PTK=56.2+3(32+16.4)=400(dvC)`
`2Fe,3S,12O`
`+CuSO_4. 5H_2O`
`PTK=64+32+16.4+5(1.2+16)=250(dvC)`
`1Cu,1S,9O,10H`
`#Devil`