WEB Ideal Gas Law

WEB Ideal Gas Law - Ideal Gas Law and the Molar Volume of a...

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Ideal Gas Law and the Molar Volume of a Gas Basic Assumption: Gases at STP (273 K and 1 atm, 101.3 kPa or 760 mmHg) have a volume of 22.4 L How many moles of Helium are in 22.4 L? Step 1: 1 mole of gas occupies 22.4 L So, 22.4 L of Helium (or any gas) is 1 mole of gas 0.25 moles of Oxygen gas would have what volume? Step 1: 1 mole is 22.4 L (0.25 moles) x mole L 4 . 22 = 5.6 L 12 moles of CO 2 have what volume? Step 1: 1 mole is 22.4 L (12 moles) x mole L 4 . 22 = 268.8 L The basic equation we will be using in this unit is: PV=nRT P = Pressure in kPa or atm V = in liters n = the number of moles R = 8.31 K mole L kPa or 0.821 K mole L atm T = in Kelvin Alternatively we could write this equation as: PV=( MW grams )RT With this variant we can find the number of grams of a gas if we know the Molecular Weight

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Sample Problems: 1. How many moles of O 2 gas would fit in a 37.0 liter vessel at 60.00°C at a pressure of 3.50 atm? Step 1: Circle the variables and assign letters How many moles of O 2 gas would fit in a 37.0 liter vessel at 60.00°C at a pressure of 3.50 atm?
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