Moles & Formulas
Presentation
•
Chemistry
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11th Grade
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Practice Problem
•
Medium
Lucila Giammatteo
Used 2+ times
FREE Resource
11 Slides • 11 Questions
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Moles
By Lucila Giammatteo
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Units of Elementary Entities
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Relative Formula Mass
The mass of a compound relative to 1/12 the mass of an atom of carbon-12. Does not have any units.
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Draw
Use the periodic table to determine the relative atomic mass or relative formula mass for the following elements and compounds.
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Draw
Determine Mr for each compound in the chart
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Mr or Molar Mass?
Mr is adimensional, no units
Molar mass is defined as the mass in grams of 1 mole of a substance.
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Law of Definite Proportions
For any given compound, the ratio of constituent elements is fixed. Also known as law of definite composition or Proust's law.
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Percentage Composition by Mass
The relative amount for each element in a compound.
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Draw
Determine the percentage composition by mass of glucose, C6H12O6.
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Determining chemical formulas from %
The percentage composition by mass of sodium chloride is 39.3% sodium (Na) and 60.7% chlorine (Cl). Determine the empirical formula of sodium chloride.
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Draw
A compound was collected and analysed to contain 25.94% nitrogen and the rest is oxygen. Determine the empirical formula.
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The percentage composition by mass of aluminium chloride is 20.3% aluminium (Al) and 79.7% chlorine (Cl). Determine the empirical formula of aluminium chloride. The relative formula mass of the compound, Mr, is 267. Use this value to calculate the molecular formula of the compound.
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Moles
By Lucila Giammatteo
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