# 1.1.2 MOLES & EQUATIONS

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What is relative isotopic mass?
the mass of an isotope compared to 1/12 of the mass of an atom of C12
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What is an isotope?
atoms of an element with the same number of protons and electrons but a different number of neutrons
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What is relative molecular mass?
the weighted meanness of a molecule compared to 1/12 of an atom of C12
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What is relative formula mass?
the weighted mean mass of a formula unit compared with 1/12 of the mass of an atom of C12
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What is the amount of a substance?
mass of a substance that has the same number of particles as 12g of C12
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number of particles present is one mole of carbon
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What is the value of Avogadro's constant?
6.02x10^23
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How would you calculate the number of particles present?
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What is molar mass?
the mass of 1mol of a substance
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What are the units of molar mass?
g mol^-1
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What is relative atomic mass?
Weighted mean mass of an atom compared to 1/12 of the mass of an atom of C12
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How would would you calculate the relative atomic mass of a substance when given the percentages of it's isotopes?
((% x mass) + (% x mass)) / 100
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What is an empirical formula?
simplest whole number ratio of atoms of each element present in a compound
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How do you calculate the empirical formula?
find n of moles // divide by smallest // create whole number
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What is a molecular formula?
the actual number of each element present in a molecule
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where is the mass of an atom concentrated?
in its nucleus
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What is the mass of an electron?
1/2000
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How do you calculate % yield?
actual yield / theoretical yield x 100
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When using volume, why is 24 used?
1mol of gas occupies 24dm^3 of mass at RTP
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## Other cards in this set

### Card 2

#### Front

What is an isotope?

#### Back

atoms of an element with the same number of protons and electrons but a different number of neutrons

### Card 3

#### Front

What is relative molecular mass?

### Card 4

#### Front

What is relative formula mass?

### Card 5

#### Front

What is the amount of a substance?