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


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