moles of compounds
DESCRIPTION
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 PresentationTRANSCRIPT
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Moles of Compounds
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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.
![Page 3: Moles of Compounds](https://reader036.vdocuments.us/reader036/viewer/2022062410/56816618550346895dd9687e/html5/thumbnails/3.jpg)
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.
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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.
![Page 5: Moles of Compounds](https://reader036.vdocuments.us/reader036/viewer/2022062410/56816618550346895dd9687e/html5/thumbnails/5.jpg)
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
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What is the molar mass for potassium oxide (K2O)?
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What is the molar mass for potassium oxide (K2O)?
2 mols K =
1 mol O =
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What is the molar mass for potassium oxide (K2O)?
2 mols K 39.0983 g =
1 mol
1 mol O 15.9994 g =
1 mol
![Page 9: Moles of Compounds](https://reader036.vdocuments.us/reader036/viewer/2022062410/56816618550346895dd9687e/html5/thumbnails/9.jpg)
What is the molar mass for potassium oxide (K2O)?
2 mols K 39.0983 g = 78.1966 g K
1 mol
1 mol O 15.9994 g = 15.9994 g O
1 mol
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What is the molar mass for potassium oxide (K2O)?
K2O = 78.1966 g + 15.9994 g = 94.1960 g
2 mols K 39.0983 g = 78.1966 g K
1 mol
1 mol O 15.9994 g = 15.9994 g O
1 mol
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If you have 560 grams of K2O, how many moles do you have?
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If you have 560 grams of K2O, how many moles do you have?
560.0 g K2O =
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If you have 560 grams of K2O, how many moles do you have?
560.0 g K2O 1 mol =
94.196 g
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If you have 560 grams of K2O, how many moles do you have?
560 g K2O 1 mol = 5.945 mol K2O94.1960 g
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If you have 3.4 moles of K2O, how many grams do you have?
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If you have 3.4 moles of K2O, how many grams do you have?
3.4 mols K2O =
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If you have 3.4 moles of K2O, how many grams do you have?
3.4 mols K2O 94.1960 g =
1 mol
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If you have 3.4 moles of K2O, how many grams do you have?
3.4 mols K2O 94.1960 g = 320 g K2O1 mol