Question

Convert 12.044 × 10²³ number of He atoms into number of moles.

Answer 1

We know, 1 mole = 6.022 × 10²³ (Na = Avogadro’s number) 

The number of moles = \(\frac{Given\,number\,of\,atoms}{Avogadro's\,number}\)

Number of moles = \(\frac{12.044\times10^{23}}{6.022\times10^{23}}\)

Number of moles = 2 

Thus, number of moles of He is 2.