(i) 92 grams of sodium:
Given: Mass of sodium = 92g
Molar mass = 23g/mol
To calculate the number of moles, we apply the formula:
Number of moles =\(\frac{Mass\,of\,sodium}{Molar\,mass\,of\,sodium}\)
Number of moles = \(\frac{92g}{23 g/mol}\)
⇒ Number of moles = 4 mol
Thus, the number of moles in 92 grams of sodium is 4 mol.
(ii) 108 grams of aluminium:
Given: Mass of aluminium = 108g
Molar mass = 27g/mol
To calculate the number of moles, we apply the formula:
Number of moles = \(\frac{Mass\,of\,aluminium}{Molar\,mass\,of\,aluminium}\)
Number of moles = \(\frac{108g}{27 g/mol}\)
⇒ Number of moles = 4 mol
Thus, the number of moles in 108 grams of aluminium is 4 mol.
