Question

Question 23
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is $24gmo{l}^{-1}$.

Answer 1

Molar atomic mass of magnesium = $24gmo{l}^{-1}$
Number of moles = $\frac{Givenmass}{Molarmass}$
Number of moles of Mg $=\frac{12g}{24gmo{l}^{-1}}=0.5mol$ .