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CBSE Class 9 Answered

From 200 mg of CO? , 10 to the power 21 molecules are removed. How many moles of CO? are left ?
Asked by MANISHA MOHANTY | 28 Dec, 2011, 07:46: PM
answered-by-expert Expert Answer

No. of moles of CO in 200 mg = 200 x10-3/28

                                           = 0.0071 mole

No. of molecules in 0.0071 mole of CO = 0.0071 x 6.022 x1023

                                                                =4.28 x 1021 molecules of CO

Since, 1021 molecules are removed, therefore number of molecule remaining are 3.28 x1021

Answered by | 29 Dec, 2011, 10:14: AM

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