Question

If 10^20 molecules are removed from 220 mg of C02 then the no of moles of CO2 left are

Answer 1

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No of moles of CO2 initially = weight of substance(gm)/ molecular mass

No.of moles of CO2 initially = 0.2/44 = 1/220 mol

No. of moles removed = no. of molecules/ avagardo constant

No. of moles removed = 1021/ (6 × 1023) = 1/600 mol

No. of moles left = 1/220 – 1/600 = 0.028