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**Aim: How to convert from moles to volume and vice versa**

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**Avogardo’s Hypothesis**

Avogadro's hypothesis says that the same volume of gas contains the same number of particles. It does not matter what gas you have, they all contain the same number of particles provided that they are at the same temperature and pressure.

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STP Volume of gas and temperature are usually measured at STP. Standard temperature and pressure (STP) means temperature of 0oC and a pressure of kPa, or 1 atmosphere (atm). At STP, 1 mole or 6.02 x representative particles of any gas occupies a volume of 22.4 L.

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**Calculating from moles of gas to volume of gas**

Volume of gas = moles of gas x 𝐿 1 𝑚𝑜𝑙 Conversion Factor

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**Calculating the volume of a gas at STP**

Determine the volume, in liters, of 0.60 mol SO2 gas at STP. Identify known and unknown. Known Unknown 1 mol = 22.4 L volume of 0.60 mol SO2 0.60 mol SO2

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**2. Set up equation Volume = 0. 60 mol SO2 x 22**

2. Set up equation Volume = 0.60 mol SO2 x 22.4 𝐿 1 𝑚𝑜𝑙 SO2 Volume = 13 L SO2

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**What is the volume of these gases at STP?**

3.20 x 10-3 mol CO2 3.20 x 10-3 mol CO2 x 22.4 L / 1 mol = L CO2 b mol N2 3.70 mol N2 x 22.4 L / 1 mol = 82.9 L N2

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**Converting from volume of gas to moles of gas**

Conversion Factor Moles of gas = volume of gas x 1 𝑚𝑜𝑙 22.4 𝐿

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**Calculating number of moles of a gas at STP**

How many moles of helium at STP will fit into a 39.6 L container? Identify known and unknown. Known Unknown 1 mol = 22.4 L # of moles 39.6 L

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**Moles = 1.77 mol He 2. Set up equation**

Moles = 39.6 L He x 1 𝑚𝑜𝑙𝑒 𝐻𝑒 22.4 𝐿 𝐻𝑒 Moles = 1.77 mol He

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**How many moles of argon atoms are present in 11**

How many moles of argon atoms are present in 11.2 L of argon gas at STP? 11.2 x 1mol / 22.4 L = moles

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**Calculating Molar Mass From Density**

Reminder: Density= mass / volume Density = molar mass / molar volume Molar mass = density x molar volume 𝑔𝑟𝑎𝑚𝑠 𝑚𝑜𝑙𝑒 = 𝑔𝑟𝑎𝑚𝑠 𝑙𝑖𝑡𝑒𝑟𝑠 x 𝐿 1 𝑚𝑜𝑙𝑒 Molar volume Molar Mass density

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**Calculating molar mass of gas at STP**

The desnity of a gaseous compound containing carbon ad oxygen is found to be g/L at STP. What is the molar mass of this compound. List known and unknown. Known Unkown Density = g/L molar mass ? 1 mol = 22.4 L

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**Molar mass = 1.964 𝑔 1 𝐿 x 22.4 𝐿 1 𝑚𝑜𝑙 Molar mass = 44.0 g/mol**

2. Set up equation. Molar mass = 𝑔 1 𝐿 x 𝐿 1 𝑚𝑜𝑙 Molar mass = 44.0 g/mol

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**What is the density of krypton gas at STP**

Find molar mass of krypton molar mass = 83.8 g/mol 2. Set up Equation Density (g/L) = molar mass/ molar volume Density= 𝑔/𝑚𝑜𝑙 22.4 𝐿/𝑚𝑜𝑙 or Density= (83.8 g/1 mol) x (1 mol / 22.4 L) Density of Kr = 3.74 g/L

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