What is the mass of carbon in 28.160 gram molecules of CO2?

Answer 1

The molar mass of CO₂ is:

Carbon: 12.011(1) = 12.011

Oxygen: 15.999(2) = 31.998

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Total: 44.009 g/mol

Since there is 28.160 gr, then (28.160 g)/(44.009 g/mol) = 0.639869 moles

In every mole of CO₂ there is one mole of carbon so there is 0.639869 moles of carbon in the sample.

The molar mass of carbon is 12.011 g/mol so (0.639869 mol)(12.011 g/mol) = 7.6855 grams of carbon