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Moles and Gases
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Achievement Indicators Determine relationships between molar
quantities of gases at STP define STP and state the molar volume of a gas at
STP (i.e., 22.4 L/mol)
determine experimentally the molar volume of a gas at room temperature and pressure
calculate the moles or mass of a gas from a given volume at STP or vice versa
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Gases and Moles The volume occupied by a certain amount of
gas depends on the temperature and pressure
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Standard Temperature and Pressure (STP) Standard Temperature 0°C (273 K) Standard Pressure 101.3 KPa (1
atmosphere)
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The volume of one mole of any gas @ STP is…
22.4 L
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The Molar Volume @ STP is
Only For Gases at STP
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Flowchart
Moles Litres at
STP
Divide by 22.4L mol
Multiply by 22.4 L mol
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Calculations1. Find the volume occupied by 0.600 moles of
CO2 at STP.
0.600mol x
= 13.4 L
22.41
Lmol
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Calculations2. Find the number of moles in 264.0 mL
sample of NO2 at STP.
264.0 mL x x
= 1.18 x 10-2 mol
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Homework p. 83 # 11 & 12
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x (1mol / ?g)
x (?g / 1mol)
x (1mol / 22.4L)
x (22.4L / 1 mol)
Volume at STP
Mass(g) 1 MOLE
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Calculations Find the volume occupied by 22.0 g of CO2(g)
at STP Plan: g mol L
22.0 g CO2 x x
= 11.2 L
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Now You Trya) Find the mass of a 200.0 mL sample of NO2
(g) at STP. Plan mL L mol g
200.0 mL x x x
= 0.411g
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b) Find the volume occupied by 3.60 Kg of fluorine at STP.
• Kg g mol L
3.60 Kg x x x
= 2.12 x 103 L
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Homeworkp. 83 #11 & 12p. 86 & 87# 22 (b & i) #24 (a,c,e,g)