Answer: The atomic mass of this element in atomic mass units is 20.3
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Let atomic mass of element is X amu
[tex]6.023\times 10^{23}[/tex] atoms weigh = X amu
1 atom weigh = [tex]\frac{X}{6.023\times 10^{23}}\times 1=3.38\times 10^{-23}amu[/tex]
[tex]X=20.3amu[/tex]
Atomic mass of this element in atomic mass units is 20.3
