Section 10.2
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Chemistry, Science
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10th - 12th Grade
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Hard
Sara Wilson
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4 Slides • 0 Questions
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Section 10.2
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Molar Mass of Compounds
We find the molar mass of an element from its value on the periodic table
We also work with compounds
For example- 1.29 mol of water = ? g
We need to know how much 1 mole of water weighs
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To find the molar mass of a compound:
Determine the number of atoms of each element in the compound
Multiply this number by the average atomic mass (# on the Periodic Table) of each corresponding element.
Add together the totals for each element.
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For Water:
2 atoms of H at 1.0079 g = 2.0158 g
1 atom of O at 15.999 g = 15.999 g
2.0158 g + 15.999 g = 18.015 g (molar mass of H2O)
Section 10.2
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