The Mole (3.2.1) |
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The Mole (3.2.1)
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Avogadro’s Law states that at the same conditions of temperature and pressure, equal amounts of gases occupy the same volume of space
At room temperature and pressure, the volume occupied by one mole of any gas was found to be 24 dm3 or 24,000 cm3
This is known as the molar gas volume at RTP
RTP stands for “room temperature and pressure” and the conditions are 20 ºC and 1 atmosphere (atm)
From the molar gas volume the following formula triangle can be derived:
Formula triangle showing the relationship between moles of gas, volume in dm3 and the molar volume If the volume is given in cm3 instead of dm3, then divide by 24,000 instead of 24:
Formula triangle showing the relationship between moles of gas, volume in cm3 and the molar volume The formula can be used to calculate the number of moles of gases from a given volume or vice versa Simply cover the one you want and the triangle tells you what to do To find the volume of a gasVolume = Moles x Molar Volume Examples of Converting Moles into Volumes Table
To find the moles of a gas Moles = Volume ÷ Molar Volume Examples of Converting Volumes into Moles Table
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