Avogadro's Law

• 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 cm^3?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

Volume = Moles x Molar Volume

Examples of Converting Moles into Volumes Table

To find the moles

Moles = Volume ÷ Molar Volume

Examples of Converting Volumes into Moles Table

轉(zhuǎn)載自savemyexam