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b)(NH4)2CO3=2*14u+8*1u+12u+3*16u=96u
c)3Mg=3*24u=72u
d)MgO=24u+16u=40u
e)NaF=23u+19u=42u
f)CaO=40u+16u=56u
g)H2SO4=2*1u+32u+4*16u=98u
b) 2*14+8*1+12+48=96u
c)3*24=72u
d)24+16=40u
e)23+19=42u
f)40+16=56u
g)2+32+64=98u