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* 10^(-3)`

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number
`6.023* 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}=(0.457g)/(58.5g/mol)=7.8* 10^(-3)moles`

Thus the number of moles in 0.457 grams of NaCl, sodium chloride is
`7.8* 10^(-3)`