If 10^21 molecules are removed from 200 mg of CO2, then the number of moles of CO2 left are —

Question

10²¹ molecules are removed from 200 mg of CO₂, then the number of moles of CO₂ left are —

(A) 0.288 x 10^-3

(B) 2.88 × 10^-3

(C) 28.8 × 10^-3

(D) 1.66 x 10^-2

Answer 1

The number of moles of CO₂ left are 2.88 × 10^-3. So, The correct option of this question is (B).

Solution —

200 mg of CO = 0.2/44 mol CO₂

_{Remaining mole of CO2}