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Q.

Calculate the mass of 6.022 x 10 23 number of Chlorine(Cl2) molecules.

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a

35.5g

b

142g

c

3.55g

d

71g

answer is B.

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Detailed Solution

Given: Number of particles (N) = 6.022 x 1023
               Avogadro's number(N0) = 6.022 x 1023
Solution:
No of moles = Number of particles givenAvogadro's number 


                         =6.022x 10236.022 x 1023
                          = 1
Molar mass of chlorine (Cl2) molecules = 35.5X 2 = 71g

Mass of a substance = Molar mass of a substance × Number of moles of a substance
                                          = 71 x 1
                                          = 71g
The mass of 6.022 x 1023 number of chlorine (Cl2) molecules is 71g.

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