Question

1021 molecules are removed from 200 mg of co2. The number of moles of co2 left is

Answer 1

Hi there,

First lets find the number of molecules in the sample

n = ms ÷ Mwt = 200 ×10^-3 ÷ 44

n = 4.54 × 10^-3

Number of molecules is equals the number of moles time avogadro's number

Nu = n × NA

Nu = 4.54×10^-3 ×6×10^23

Nu = 2.73×10^21 molecule

Nu left is 2.73×10^21 - 1021= 2.72×10^21 molecule

Number of moles 2.72×10^21 ÷ 6×10^23 = 0.0045 mol

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Answer 2

Answer:

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