1) Mr( H3PO4) = 1×3+31×1+16×4= 98
2) Mr(NO2)=14+16×2= 46
3) Mr(CH4)=12+1×4= 16
4) Mr(Ca(OH)2) = 40+16×2+1×2= 74
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1) Mr( H3PO4) = 1×3+31×1+16×4= 98
2) Mr(NO2)=14+16×2= 46
3) Mr(CH4)=12+1×4= 16
4) Mr(Ca(OH)2) = 40+16×2+1×2= 74