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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) (NH4)2CO3= 2*14u + 8*1u+ 12u+ 3*16u= 96u
h) Mg3(PO4)= 3*24u+ 2*31u+8*16u= 72u+ 62u+ 128u= 262u
i) MgO= 24u+ 16u= 40u
j) NaF= 14u+ 19u=33u
k)CaO= 40u+16u= 56u
l) H2SO4= 2*1u+32u+4*16u= 98u