Moles of Compounds. A properly written compound shows the ratio of atoms in the compound. For example, sodium carbonate (Na 2 CO 3 ) shows that for every.

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Presentation transcript:

Moles of Compounds

A properly written compound shows the ratio of atoms in the compound. For example, sodium carbonate (Na 2 CO 3 ) shows that for every 1 compound there are 2 atoms of Na, 1 atom of C, and 3 atoms of O.

This also works with the mole. For 1 mole of the compound, there are 2 moles of Na, 1 mole of C, and 3 moles of O. This information allows us to calculate the molar mass of the entire compound, often called the formula mass.

2 mols Na g = g Na 1 mol 1 mol C g = g C 1 mol 3 mols O g = g O 1 mol The total molar mass of Na 2 CO 3 is g.

Once it is known that 1 mol of Na 2 CO 3 = g, conversion factors can be made of this information: These conversion factors can then be used in other calculations g Na 2 CO 3 or 1 mol g Na 2 CO 3

What is the molar mass for potassium oxide (K 2 O)?

2 mols K = 1 mol O =

What is the molar mass for potassium oxide (K 2 O)? 2 mols K g = 1 mol 1 mol O g = 1 mol

What is the molar mass for potassium oxide (K 2 O)? 2 mols K g = g K 1 mol 1 mol O g = g O 1 mol

What is the molar mass for potassium oxide (K 2 O)? K 2 O = g g = g 2 mols K g = g K 1 mol 1 mol O g = g O 1 mol

If you have 560 grams of K 2 O, how many moles do you have?

560.0 g K 2 O =

If you have 560 grams of K 2 O, how many moles do you have? g K 2 O1 mol = g

If you have 560 grams of K 2 O, how many moles do you have? 560 g K 2 O1 mol = mol K 2 O g

If you have 3.4 moles of K 2 O, how many grams do you have?

3.4 mols K 2 O =

If you have 3.4 moles of K 2 O, how many grams do you have? 3.4 mols K 2 O g = 1 mol

If you have 3.4 moles of K 2 O, how many grams do you have? 3.4 mols K 2 O g = 320 g K 2 O 1 mol