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What is the numner of molecules of CO(2)...

What is the numner of molecules of `CO_(2)` which contain 8g of `O_(2)` ?

Text Solution

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Molar mass of `CO_(2)=12+2 xx 16 = 44` g
32 g of oxygen `(O_(2))` are present in `CO_(2)=44g`
8 g of oxygen `(O_(2))` are present in `CO_(2)=(44)/((32g))xx(8g)=11 g`
Now, 44 g of `CO_(2)` contain molecules `= 6.022 xx 10^(23)`
11 g of `CO_(2)` contain molecules `= (6.022xx10^(23)xx(11g))/((44g))=1.5xx10^(23)` molecules.
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