1. Chem
Get Gases MC Practice WS stamped off if you did not do so last class.
Unit 8 Test Fri 2/22

2. PV=nRT Ideal Gas Law n= # moles R=universal gas constant
Describes the state of a hypothetical ideal gas.
Good approximation of the behavior of many gases under many conditions.
PV=nRT
n= # moles
R=universal gas constant
Will be GIVEN on tests/quizzes!
R is the universal gas constant.
To determine which R to use in your equation you have to look at the _____________.
Pressure units being used!!

3. n=2.30 mol
PV = nRT
T= =318 K
3.4 x V = 2.30 x x 318
V= L
P=3.4 atm
R =
V=?

4. Ideal Gas Law Examples
1) L
2) 1984 K

5. moles
mol
𝒙 𝟒.𝟎𝟎 𝒈 𝟏 𝒎𝒐𝒍𝒆

6. = = = =
𝟓.𝟏𝟔 𝒈 𝟎.𝟎𝟑𝟗 𝒎𝒐𝒍𝒆𝒔

7. Avogadro’s Law
Equal volumes of gases at the same pressure and temperature contain the same # of molecules

8. Avogadro’s Law Direct relationship increases
As volume increases the number of moles _____________.

9. Molar Volume The volume of one mole of a substance
1 mole of any gas at STP is 22.4L
If you have one mole each of O2 and H2, they will have the ______________ volume and __________ masses.
same
different

10. 𝒙 𝟐𝟐.𝟒 𝑳 𝟏 𝒎𝒐𝒍𝒆
mol
= 1.52 L
𝟐𝟐.𝟒 𝑳 𝟏 𝒎𝒐𝒍
7.08 mol
=159 L

11. Add to Cover Sheet
Avogadro’s Law
1 mole of gas at STP = 22.4 L

12. Gas Stoichiometry 1 2 1 2

13. 3.5 L H2
𝟏 𝑳 𝑵 𝟐 𝟑 𝑳 𝑯 𝟐
=1.17 L N2

14. 22.4
𝟏 𝒎𝒐𝒍𝒆 𝟐𝟐.𝟒 𝑳
𝟐𝟐.𝟒 𝑳 𝟏 𝒎𝒐𝒍𝒆
𝟏 𝒎𝒐𝒍 𝑵 𝟐 𝟑 𝒎𝒐𝒍 𝑯 𝟐
0.100 mol H2
𝟐𝟐.𝟒 𝑳 𝑵 𝟐 𝟏 𝒎𝒐𝒍 𝑵 𝟐
=0.747 L N2