Fundamental Ideas 2

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Relative Atomic Mass definition
The average mass of an atom compared with the mass of an atom of Carbon-12.
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Relative Molecular Mass definition
The sum of the relative atomic masses of the atoms making up a molecule.
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Relative Formula Mass definition
The sum of the relative atomic masses of the atoms making up a compound containing ions.
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Mole definition
1 mole is the amount of a substance which is made up of the same number of particles as there are carbon atoms in 12g of carbon-12.
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What is the Avogadro number?
6.02 x 10^23, this is the number of carbon atoms in 12g of carbon-12.
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How to find the number of moles in a substance
Number of moles = mass (g) / mass of 1 mole (molecular mass)
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Empirical formula definition
The simplest whole number ratio of atoms in a substance.
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Percentage composition definition
The percentage of a substance made up by one element.
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How to find percentage composition
Mass of element you want / molecular mass of whole molecule * 100
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How to calculate percentage yield
Actual yield / theoretical yield * 100
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3 reasons theoretical yield not obtained
Reaction could be reversible, some product may be lost, some of the reactants might react differently to expected.
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Other cards in this set

Card 2

Front

Relative Molecular Mass definition

Back

The sum of the relative atomic masses of the atoms making up a molecule.

Card 3

Front

Relative Formula Mass definition

Back

Preview of the front of card 3

Card 4

Front

Mole definition

Back

Preview of the front of card 4

Card 5

Front

What is the Avogadro number?

Back

Preview of the front of card 5
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