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9 Cards in this Set
- Front
- Back
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The mole is simply the name given to a certain what?
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Number
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One mole of atoms or molecules of any substance will have a mass in grams equal to what?
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The relative formula mass for that substance
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Molar mass is another way of saying what?
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"The mass of one mole"
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What is molar mass measured in?
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Grams per mole, for example carbon has a molar mass of 12g/mol
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What is the formula relating moles, mass and Mr |
Number of moles = Mass in grams (of element or compound) ÷ Mr (of element or compound)
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How many moles are there in 66g of carbon dioxide?
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Mr of CO2 = 12+(16x2) = 44 No. of moles= Mass (g) / Mr = 66/44 = 1.5 moles |
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The RELATIVE FORMULA MASS of an element is the average mass of an atom of the element compared to the mass of 1/12th of an atom of what?
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CARBON 12
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How do you work out the percentage composition by mass? |
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What are empirical formulas?
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They are the simplest ratio of atoms in a compound
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