If 10 raise to power 21 molecules are removed from 200 mg of CO2,then how many moles of CO2 are left?(Old and urgently dear experts)

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Answer 1 · 2016-09-26T14:10:31

$"Molar mass of "CO_2"=44g/"mol"$

$"Amount of "CO_2 " taken"=200mg=(0.2g)/(44g/"mol")$
$=4.55xx10^-3mol$

$"Number of mlecules of "CO_2" removed"=10^21$

$"1 mol = "6.023xx10^23 "molecules of "CO_2$

$10^21" molecules "=10^21/(6.023xx10^23)mol$

$=1.66xx10^-3mol$

$CO_2" left"=(4.55-1.66)xx10^-3mol$
$=2.89xx10^-3mol$