Va rog frumos sa ma ajutati la aceasta tema la chimie!!!

Răspuns:
Explicație:
1.Zn+2HCl=ZnCl2+H2
CaO+H2O=Ca(OH)2
CaCl2+AgNO3=Ca(NO3)2+2AgCl
2.MgCl2
M=AMg+2ACl=24+2*35,5=
Rm=AMg:2ACl=24:2*35,5
Ra=1:2
3. mK2O=8.53 g K2O+2HCl=2KCl+H2O
mKCl=? MK2O=2AK+AO=2*39+16=94
MKCl=AK+ACl=39+35.5=74.5
94gK2O..................2*74,5gKCl
8,53g....................x=