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Q.

The number of molecules present in 2.2 g of carbon dioxide are:


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a

1.1× 1023  

b

0.3011× 1023  

c

2× 1023  

d

3× 1023   

answer is A.

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Detailed Solution

detailed_solution_thumbnail
The number of molecules present in 2.2 g of carbon dioxide is 0.3011× 1023.
The molar mass of CO2 = 44 g/mol.
So, there are 6.022 × 1023.molecules of CO2 in 44g.
⇒1 g of  CO2  = 6.022 × 1023  44 molecules of CO2  ⇒2.2 g of CO2  = 2.2  × 6.022 × 1023  44 molecules of CO2  ⇒2.2 g of CO2  = 0.3011× 1023  molecules of CO2  .
 
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