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Which of the following contain same number of atoms as in 20g of calcium?A. 24g of magnesiumB. 12g of carbonC. 8g of oxygen gasD. 16g of oxygen atom

Which of the following contain same number of atoms as in 20g of calcium?A. 24g of magnesiumB. 12g of carbonC. 8g of oxygen gasD. 16g of oxygen atom

Grade:11

1 Answers

Arun
25750 Points
6 years ago
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.
 
Regards
Arun (askIITians forum expert)

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