Mole ConceptHard
Question
1021 molecules are removed from 200mg of CO2. The moles of CO2 left are :
Options
A.2.88 × 10-3
B.28.8 × 10-3
C.288 × 10-3
D.28.8 × 103
Solution
No. of moles = 
no. of moles in 200mg =
= 4.5 × 10-3 moles
No.of moles in 1021 molecules
= 1.67 × 10-3 moles
No. of moles left = (4.5 - 1.67) × 10-3
= 2.88 × 10-3
no. of moles in 200mg =
= 4.5 × 10-3 molesNo.of moles in 1021 molecules
= 1.67 × 10-3 molesNo. of moles left = (4.5 - 1.67) × 10-3
= 2.88 × 10-3
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