Answer: The moles of sodium are 0.012 moles and number of atoms are [tex]7.23\times 10^{21}[/tex] that are recommended daily allowance
Explanation:
We are given:
Mass of sodium recommended in daily allowance = 270 mg
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given mass of sodium = 270 mg = 0.270 g (Conversion factor: 1 g = 1000 mg)
Molar mass of sodium = 23 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of sodium}=\frac{0.270g}{23g/mol}=0.012mol[/tex]
According to mole concept:
1 mole of an element contains [tex]6.022\times 10^{23}[/tex] number of atoms
So, 0.012 moles of sodium will contain = [tex](0.012\times 6.022\times 10^{23})=7.23\times 10^{21}[/tex] number of atoms
Hence, the moles of sodium are 0.012 moles and number of atoms are [tex]7.23\times 10^{21}[/tex] that are recommended daily allowance
