Question

Which of the following has the largest number of atoms?
(A) 0.5 g atoms of Cu
(C) 0.25 moles of Cu atoms
(8) 0.635 g of Cu
(D) 1 g of Cu​

Answer 1

Answer:

Option (D)  1 gram of Cu [copper]has the largest No.of atoms.

Explanation:

A) 0.5 g atoms of Cu

NO OF ATOMS=0.5*6.023*10^23 ATOMS

                         = 3.011*10^23 ATOMS

B) 0.25 moles of Cu

NO.OF ATOMS=0.25*6.023*10^23 ATOMS

                        =1.5055*10^23 ATOMS

C) 0.635 g of Cu      

NO.OF MOLES=0.635/63.5[atomic weight of Cu]

                         =0.010 [10^-2]MOLES

                         =6.023*10^21 ATOMS [10^23+10^-2]

D) NO OF MOLES=6.35*10^20 AMU/6.35 AMU

                           =10^20

NO OF ATOMS=[6.023*10^23]*10^20*

​                           =6.023*10^43 ATOMS

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