Q.

8 g of O2 has the same number of molecules as:

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a

28 g of CO

b

11 g of CO2

c

14 g of CO

d

7 g of CO

answer is A, D.

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Detailed Solution

Moles of O2​= 8​ /32 =0.25 moles

No. of molecules =No. of moles × NA​

Thus, no. of moles is directly proportional to no. of molecules.

Moles of 7 gm CO= 7/28​ =0.25

Moles of 14 gm CO= 14​ /28 =0.5

Moles of 22 gm CO2​= 22​ /44 =0.5

Moles of 11 gm of CO2 =11/44 =0.25

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