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 \(7.8\times 10^{-3}\)
