Final answer:
80g of NaOH is equivalent to 2 moles, as the molar mass of NaOH is 40.00 g/mol and the number of moles is calculated by dividing the mass by the molar mass.
Step-by-step explanation:
To calculate how many moles of NaOH are present in 80g of NaOH, use the molar mass of NaOH which is 40.00 g/mol. The number of moles of a substance is determined by dividing the mass of the substance by its molar mass. Accordingly, the calculation will be:
Amount in moles = Mass in grams / Molar mass in g/mol
Amount in moles = 80g / 40.00 g/mol
Amount in moles = 2 mol
Therefore, 80g of NaOH is equivalent to 2 moles when you use the molar mass of NaOH (40.00 g/mol).