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MHNO3=AH+AN+3AO=1+14+3x16=1+14+48=63g/mol

MH3PO=3+31+64=98g/mol

MCaCO3=40+12+3*16=100 g/mol

M(NH4)2SO4= 2(AN+4AH)+AS+4AO=2(14+4*1)+32+4*16=132g/mol

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