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Question

Calculate the number of oxygen atoms in 0.10 mole of Na​​2​​​​ Co​​​​​3 . 10H2 ​​​​​​o

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Solution

Oxygen has molar mass of 16.
Oxygen amount in Na2CO3.10H2O is 10 O+ 3 O
13 Oxygen atoms.
13*16= 208.
So 1 Mole of Na2CO3.10H2O has 208 gms of oxygen atoms. But 0.1 Mole has 20.8 gms of oxygen.

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