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Q.

The number of molecules of CO2  present in 44g of CO2  is _______

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a

12×1023

b

3×1010

c

6.0×1023

d

3×1023

answer is A.

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Detailed Solution

Molecular weight of CO2  =  1x12 +  2 x 16

                                                   = 44

No of moles =  Weight in grams/Molecular weight

                           =  44/44 = 1 mole

 

1 mole contain 6×1023 molecules.

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