1.

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

Answer»

Solution :(i) `"1 mole of He"=6.022xx10^(23)" atoms"`
`therefore"52 mol of He"=52xx6.022xx10^(23)" atoms"=3.131xx10^(25)" atoms"`
(ii) `"1 atoms of He = 4 U of He"`
`" 4 u of He = 1 atom of He"`
`therefore"52 u of He"=(1)/(4)XX" 52 atoms = 13 atoms"`
(III) `"1 mole of He = 4 g "=6.022xx10^(23)" atoms"`
`therefore"52 g of He "=(6.022xx10^(23))/(4)xx" 52 atoms"=7.8286xx10^(24)" atoms"`


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