Question

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

• A. 4
• B. 5.6
• C. $8.431 \times 10^{23}$
• D. $3.372 \times 10^{24}$

Answer 1

Answer: (D)

$3.372 \times 10^{24}$

Answer 2

No. of atoms in $1$ mole of $PCl_{3} = 4$

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