I put this in the bottom so I cross this unit out 525 divided by 40 is going to give us 13.1 mol of calcium okay so I know now that 525 grams of calcium equals 13.1 mols of calcium and that might not seem helpful now but will definitely be helpful when you learn about future things dealing with mols. First there we have 525 grams of calcium atoms, well many mols of calcium atoms do I have? Well lets start out with the given which is 525 grams of calcium okay? Well we're to find the mass of a mol of calcium so let's get back to our periodic table and we say we know that we have 40.078 we're just going to round off to 40 grams for every mol so we have 40 grams for every one mol of calcium. ![]() ![]() So if we look at the periodic table, okay and we know these numbers underneath here represent the atomic mass of that particular atom so for example if I'm talking of potassium I know the mass of potassium is the average mass of potassium atom is 39.0983 atomic mass units but Avogadro actually discovered that if he had a mol of that unit of that atom meaning 6.02 times 10 the twenty third particles of potassium, they actually weigh 39.0983 grams that number is actually extremely useful and that that's the mass of one mol of that particular substance aka molar mass.Īlright let's use in calculation for this we see how we can apply this. ![]() We're going to talk about of molar mass and what that means? The molar mass is the mass of 1 mol of part- of particular substance so how does the mass of one atom relate to the mass of mol of atoms? Well they're the same but not really.
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