`3.011xx10^(22)` molecules are removed from a vessel Containing 1680 cc of nitrogen at STP. How many moles are remaining ?

Explanation

Number of moles of `N_(2)` originally present =`("volume")/("GMV") = (1680)/(22400) = (3)/(40)`
Number of moles of `N_(2)` removed = `("Number of molecules")/("Avogadro number") = (3.011xx10^(22))/(6.022xx10^(23)) = (1)/(20)`
Number of moles remaining `= (3)/(40)-(1)/(20) = (1)/(40) = 2.5xx10^(-2) = 0.025`