Answer: The moles of potassium element is 1.30 moles.
Explanation:
We are given:
Number of potassium atoms = \(7.85\times 10^{23}\)
According to mole concept:
\(6.022\times 10^{23}\) number of atoms are contained in 1 mole of an element
So, \(7.85\times 10^{23}\) number of atoms will be contained in \(\frac{1}{6.022\times 10^{23}}\times 7.85\times 10^{23}=1.30mol\) of potassium element
Hence, the moles of potassium element is 1.30 moles.
