a)Cl2=2*35,5u=71u
b)P4=4*31u=124u
c)KBr=39u+80u=119u
d)H2S=2*1u+32u=34u
e)NH3= 14u+3*1u=17u
f)Na2SO4=2*23u+32u+4*16u=142u
g) H2SO4=2*1u+32u+4*16u=98u
h)(NH4)2CO3=2*14u+8*1u+12u+3*16u=96u
i)Mg3(PO4)2=3*24u+2*31u+8*16u=262u
j)Fe(NO3)3=56u+3*14u+9*16u=242u
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a)Cl2=2*35,5u=71u
b)P4=4*31u=124u
c)KBr=39u+80u=119u
d)H2S=2*1u+32u=34u
e)NH3= 14u+3*1u=17u
f)Na2SO4=2*23u+32u+4*16u=142u
g) H2SO4=2*1u+32u+4*16u=98u
h)(NH4)2CO3=2*14u+8*1u+12u+3*16u=96u
i)Mg3(PO4)2=3*24u+2*31u+8*16u=262u
j)Fe(NO3)3=56u+3*14u+9*16u=242u