1.33. Calculate the number of atoms in each of the following:
(i) 52 moles of He
(ii) 52 u of He
(iii) 52 g of He
1.33. Calculate the number of atoms in each of the following:
(i) 52 moles of He
(ii) 52 u of He
(iii) 52 g of He
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1 Answer
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1.33. (i) 52 moles of Ar
Ans:1 mole of Ar = 6.022 * 1023 atoms of Ar
Therefore, 52 mole of Ar = 52 * 6.022 * 1023 atoms of Ar= 3.131 * 1025 atoms of Ar
(ii) 52 u of He
Ans:1 atom of He = 4u of the He
Or, 4 u of He = 1 atom of He
So, 52 u of He = 52/4 atom of He = 13 atoms of He.
(iii) 52 g of He
Ans:4g of He = 6.022 * 1023 atoms of He
So, 52g of He = 6.022 * 1023 * 52/4 atoms of He
= 7.8286 * 1024 atoms of He
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