# 2 Amount of substance

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• Created by: Naana
• Created on: 25-02-15 11:40
What is relative atomic mass?
Average mass of one atom of an element ÷ 1/12th the mass of one atom of carbon 12
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What is relative molecular mass?
Average mass of one molecule ÷ 1/12th the mass of an atom of carbon 12
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The number of atoms in 12g of carbon 12
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What is the ideal gas equation?
PV=nRT
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What are the units for the pressure, volume and temperature in the ideal gas equation?
Pressure=Pa, Volume=m, Temperature=K
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What is the empirical formula?
The simplest whole number ratio in which the atoms of each element present in a compound
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What is the molecular formula?
The actual number of atoms of each element that make up the compound
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How do you find moles using concentration and volume?
Moles = concentration (mol dm3) × volume (dm3)
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What is the equation used to calculate atom economy?
(Mass of useful products ÷mass of all reactants) ×100
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How are percentage yields calculated?
(Actual yield÷ theoretical yield) ×100
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How do you convert degrees into kelvin?
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How do you convert cm3 into dm3?
÷1000
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How do you convert cm3 into m3?
÷1000000
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How do you convert kPa into Pa?
×1000
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## Other cards in this set

### Card 2

#### Front

What is relative molecular mass?

#### Back

Average mass of one molecule ÷ 1/12th the mass of an atom of carbon 12

### Card 4

#### Front

What is the ideal gas equation?

### Card 5

#### Front

What are the units for the pressure, volume and temperature in the ideal gas equation?