1.

(i) Calculate the mass of 2.5 mole of oxygen atom. (ii) Calculate the number of molecules in 11g of CO_2.

Answer»

SOLUTION :(i) Number of MOLES `=("Mass")/("Atomic mass")`
`:. ` Mass = Number of moles `xx` Atomic mass
`=0.5xx16=8g`
(ii) GRAM Molecular of `CO_2=44g`
Number of MOLECULES present in 44 g of `CO_2=6.023xx10^(23)`
`:.` Number of molecules present in 11G of `CO_2=(6.023xx10^(23))/44xx11`
`=1.53xx10^(23)` molecules
(iii) Number of moles = `("Mass")/("Atomic mass")`
`81/27=3` moles


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