Question

how many molecules are in 0.80 mol of NaCl.

Answer 1

Answer: There are $4.81\times 10^{23}$ molecules in 0.80 mol of NaCl.

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.

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

0.80 mole of $NaCl$ contains = $\frac{6.023\times 10^{23}}{1}\times 0.80=4.81\times 10^{23}$ molecules

Thus there are $4.81\times 10^{23}$ molecules in 0.80 mol of NaCl.