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29/09/2020 4:21 pm
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1021 molecules are removed from 200 mg of CO2. The moles of CO2 left are :
(a) 2.88 x 10-3
(b) 28.8 x 10-3
(c) 288 x 10-3
(d) 28.8 x 103
1 Answer
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29/09/2020 4:25 pm
(a) 2.88 x 10-3
Explanation:
No. of moles = Wt. in g/Mol. wt
No. of moles in 200 mg = 200/1000 x 44
= 4.5 x 10-3 moles
No. of moles in 1021 molecules
= 1021/ 6.02 x 1023 = 1.67 x 10-3 moles
No. of moles left = (4.5 – 1.67) × 10-3
= 2.88 x 10-3