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Which of the following contains s same number of atoms as 20 g of calciam?
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Which of the following contains s same number of atoms as 20 g of calc...
We have to find how many moles of calcium is present in 20 g of it. From the Periodic table, the relative atomic mass of calcium is 40.1. 
No. of moles of calcium = 20/40.1 = 0.49875 moles  = 0.5 mole
Now
Find only moles in every case. If moles are same then ni of atoms will be same also.
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Which of the following contains s same number of atoms as 20 g of calciam?
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