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  4. A sample of phosphorus trichloride (PCl3) contains 1.4 moles of the substance. How many atoms are there in the sample ?

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Q. A sample of phosphorus trichloride $(PCl_3)$ contains 1.4 moles of the substance. How many atoms are there in the sample ?

KEAMKEAM 2004Some Basic Concepts of Chemistry

Solution:

No. of atoms in $1$ mole of $PCl_{3} = 4$
No. of atoms in $1.4$ moles of $PCl_{3}$
$ = 4 \times 1.4 \times 6.022 \times 10^{23}$
$ = 3.372 \times 10^{24}$