Question

How many molecules are there in 6.73 moles of phosphorus trichloride? (write your answer in scientific notation).

Answer 1

Answer: There are $4.05\times 10^{24}$  molecules in 6.73 moles of phosphorus trichloride

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

1 mole of $PCl_3$ contains = $6.023\times 10^{23}$  molecules

Thus 6.73 moles of $PCl_3$ contains = $\frac{6.023\times 10^{23}}{1}\times 6.73=4.05\times 10^{24}$  molecules

Thus there are $4.05\times 10^{24}$  molecules in 6.73 moles of phosphorus trichloride