To calculate the number of moles in a substance, we need to divide the mass of the substance by its molar mass. The molar mass of potassium nitrate (KNO3) is 101.1 g/mol.
To calculate the number of moles of potassium nitrate in 134.76 grams, we can use the following formula:
Number of moles = Mass / Molar mass
Number of moles = 134.76 g / 101.1 g/mol
Number of moles = 1.33 mol
Therefore, there are 1.33 moles of potassium nitrate in 134.76 grams of the substance.