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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. - PowerPoint PPT Presentation
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Moles of Compounds
A properly written compound shows the ratio of atoms in the compound. For example, sodium carbonate (Na2CO3) 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 22.9897 g = 45.9794 g Na
1 mol
1 mol C 12.0107 g = 12.0107 g C
1 mol
3 mols O 15.9994 g= 47.9982 g O
1 mol
The total molar mass of Na2CO3 is 105.9883 g.
Once it is known that 1 mol of Na2CO3 = 105.9883 g, conversion factors can be made of this information:
These conversion factors can then be used in other calculations.
105.9883 g Na2CO3or
1 mol
1 mol 105.9883 g Na2CO3
What is the molar mass for potassium oxide (K2O)?
What is the molar mass for potassium oxide (K2O)?
K2O = 2 x K + 1 x O
What is the molar mass for potassium oxide (K2O)?
K2O = 2 x K + 1 x O
K2O = (2 x 39.0983 g) + (15.9994 g)
What is the molar mass for potassium oxide (K2O)?
K2O = 2 x K + 1 x O
K2O = (2 x 39.0983 g) + (15.9994 g)
K2O = 78.1966 g + 15.9994 g = 94.1960 g
If you have 560.0 grams of K2O, how many moles do you have?
If you have 560.0 grams of K2O, how many moles do you have?
560.0 g K2O =
If you have 560 grams of K2O, how many moles do you have?
560.0 g K2O 1 mol =
94.196 g
If you have 560.0 grams of K2O, how many moles do you have?
560.0 g K2O 1 mol = 5.945 mol K2O
94.196 g
If you have 3.4 moles of K2O, how many grams do you have?
If you have 3.4 moles of K2O, how many grams do you have?
3.4 mols K2O =
If you have 3.4 moles of K2O, how many grams do you have?
3.4 mols K2O 94.2 g =
1 mol
If you have 3.4 moles of K2O, how many grams do you have?
3.4 mols K2O 94.2 g = 320 g K2O
1 mol
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
54.3 g CoCl2
=
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
54.3 g CoCl2
=129.8 g
58.93g + (2 x 35.45 g)
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
54.3 g CoCl2 1 mol CoCl2
=129.8 g
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
54.3 g CoCl2 1 mol CoCl2
=129.8 g 1 mol CoCl2
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
54.3 g CoCl2 1 mol CoCl26.022 x 1023
formula units =129.8 g 1 mol CoCl2
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
54.3 g CoCl2 1 mol CoCl26.022 x 1023
formula units = 2.52 x 1023
formula units129.8 g 1 mol CoCl2
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
2.52 x 1023 formula units CoCl2
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
2.52 x 1023 formula units CoCl2
1 formula unit CoCl2
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
2.52 x 1023 formula units CoCl2
3 atoms
1 formula unit CoCl2
If you have 54.3 grams of cobalt(II) chloride, how many formula units (compounds) and how many atoms is this?
2.52 x 1023 formula units CoCl2
3 atoms= 7.56 x 1023 atoms
1 formula unit CoCl2
