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Question

A sample of CO2 contains 2NA atoms of C. From this 110 moles of CO2 are removed what will will be remaining mass of carbon dioxide in the sample?

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Solution

Given that
No. of C atoms in CO2=2NA
Since, each CO2 contain 1 C atom.

No. of CO2 molecules, Nt=2NA

No. of CO2 molecules, removed, N2=NA10.

No. of CO2 molecules left, N=N3N2
=2NANA10=(2110)NA

No. of moles of CO2 left, n=NNA=1.9NANA
=1.9 moles

Mass of CO2 left, w=n×MCO2
=1.9×44 g
=83.6 g

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