a)Na2SO4=2*23+32+4*16=142
b)Mg(OH)2=24+2*(1+16)=58
v)KClO3=39+35+3*16=123
g)Cu(OH)=64+1+16=81
CO3=12+3*16=60
d)CoCl3:6H20= 165:6*18=165:108=1,52
j)LiH2PO4=7+2*1+31+4*16=104
3)Ca3(PO4)2=310
a)Na2SO4=2*23+32+4*16=142
b)Mg(OH)2=24+2*(1+16)=58
v)KClO3=39+35+3*16=123
g)Cu(OH)=64+1+16=81
CO3=12+3*16=60
d)CoCl3:6H20= 165:6*18=165:108=1,52
j)LiH2PO4=7+2*1+31+4*16=104
3)Ca3(PO4)2=310