Question

Calculate the number of moles in 0.457 grams of NaCl, sodium chloride

Answer 1

Take what you are given so 0.457g divide this by the molar mass (calculate this by taking the atomic weight of Na and Cl and add them together 23+35).

So 0.457gNaCl divide by (58g NaCl) =  .0078 mol Nacl

Answer 2

Answer: $7.8\times 10^{-3}$

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. and weighs equal to the molecular mass.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

Given mass of $NaCl$  = 0.457 g

Molar mass of $NaCl$ = 58.5 g/mol

$\text{Number of moles}=\frac{0.457g}{58.5g/mol}=7.8\times 10^{-3}moles$

Thus the number of moles in 0.457 grams of NaCl, sodium chloride is $7.8\times 10^{-3}$