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.

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