Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

To calculate the number of moles in 47.51 g of Al2O3, you need to know the molar mass of Al2O3.

Step 1: Calculate the molar mass of Al2O3. The molar mass of Al2O3 is calculated as follows: (2 * atomic mass of Al) + (3 * atomic mass of O) = (2 * 26.98 g/mol) + (3 * 16.00 g/mol) = 53.96 g/mol + 48.00 g/mol = 101.96 g/mol

Step 2: Use the formula to calculate the number of moles. The formula for calculating the number of moles is: Number of moles = mass (g) / molar mass (g/mol)

So, the number of moles in 47.51 g of Al2O3 is: = 47.51 g / 101.96 g/mol = 0.466 moles

So, there are approximately 0.466 moles in 47.51 g of Al2O3.