Mr(H2CO3) = 1*2 + 12 + 16*3 = 62 62:2 = 31
Mr(CO2) = 12 + 16*2 = 44 44:4 = 11
Mr(CO) = 12 + 16 = 28 28:4 =7
Mr(CaCO3) = 40 + 12 + 16*3 = 100 100:2 = 50
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Mr(H2CO3) = 1*2 + 12 + 16*3 = 62 62:2 = 31
Mr(CO2) = 12 + 16*2 = 44 44:4 = 11
Mr(CO) = 12 + 16 = 28 28:4 =7
Mr(CaCO3) = 40 + 12 + 16*3 = 100 100:2 = 50