Answer :
To find the number of moles of Na₂O in 98.2 grams, calculate the molar mass of Na₂O and then divide the given mass by the molar mass to determine the number of moles.
Find the number of moles of Na₂O:
Calculate the molar mass of Na₂O: Na (2 x 22.99) + O (16.00) = 77.96 g/mol Na₂O.
Use the formula: Number of moles = Given mass / Molar mass.
Number of moles of Na₂O = 98.2 g / 77.96 g/mol = 1.26 moles.
