(Mr)Na2CO3=23×2+12+16×3=106
(Mr)H2SO4=2+32+16×3=98
(Mr)NaHCO3=23+1+12+16×3=84
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(Mr)Na2CO3=23×2+12+16×3=106
(Mr)H2SO4=2+32+16×3=98
(Mr)NaHCO3=23+1+12+16×3=84