Question

If 6.022×10^22 atoms have been removed from 2 moles of carbon then how many moles of carbon are left?

Answer 1

The number of moles of carbon are 0.00288  moles.

Explanation:

Molar mass of CO2 = 44 g

Given mass = 200 mg = 0.2 g

No. of moles = 0.2 / 44 = 1 / 220

No. of moles = No . of molecules / Avagadro's constant

1 / 220 = No. of molecules / 6.022 x 10^23

6.022 x 10^23 / 220 = No. of molecules

= 2.73 x 1021 Molecules

Now from this 1021 molecules are removed  

2.73 x 10^21 - 10^21

1.73 x 10^21  Molecules are now left

No. of moles = Molecules / avogadro's constant

                     = (1.73 x 1021) / (6.022 x 10^23)

                      = 0.00288  moles

Hence the number of moles of carbon are 0.00288  moles.

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