Mole Problems
Mass Mole Particles Always 6.02 x 1023 part = 1 mole Molar mass (g) Avogadro’s # Mass Mole Particles (atoms, molecules, ions, etc) (g) (mol) Molar mass comes from the Periodic Table Always 6.02 x 1023 part = 1 mole
How many grams are in 2.0 moles of calcium? So, where are you starting and finishing? Moles Mass (need the molar mass of Ca) 2.0 mol Ca X 80.16 g Ca so it becomes 80. g Ca (2)
How many moles are in 25.0 grams of calcium metal? Going from mass moles 0.624 mol Ca This time the molar mass is on the bottom to cancel out the (g) we started with
How many grams of iron are present in 4.24 x 10 23 iron atoms? Going from parts moles mass 39.3 g Fe
Compounds are no different How many particles are in 40.0 grams of sodium chloride (58.44 g/mol)? Molar mass of NaCl 4.12 x 1023 NaCl particles