What is the mass of 3.50 moles of potassium nitrate?

To find the mass of 3.50 moles of potassium nitrate (KNO3), you need to know the molar mass of KNO3.

1. First, find the molar mass of each element in KNO3:

   • Potassium (K): 39.10 g/mol
   • Nitrogen (N): 14.01 g/mol
   • Oxygen (O): 16.00 g/mol

2. Then, calculate the molar mass of KNO3:

   • There is 1 atom of potassium, 1 atom of nitrogen, and 3 atoms of oxygen in each molecule of KNO3. So, the molar mass of KNO3 is (39.10 g/mol * 1) + (14.01 g/mol * 1) + (16.00 g/mol * 3) = 101.11 g/mol.

3. Finally, multiply the number of moles by the molar mass to find the mass:

   • Mass = Moles * Molar mass = 3.50 moles * 101.11 g/mol = 354.39 g.

So, the mass of 3.50 moles of potassium nitrate is 354.39 grams.