1. Warm up 5-2-16 1.Convert 65.0 mmHg to atm Reference: 1 atm = 760 mmHg = 101.325 kPa 2. A helium balloon has a volume of 2.75 L at 20 ºC. the volume decreases to 2.46 L. What is the new temperature in ºC? 3. If pressure go up what will happen to volume? Agenda -Turn in HW -Notes Unit 10-4 -Food article + Online HW Homework May 4 - Quiz unit 10 May 11 - Online HW

2. Answer: 1. c) 40.35 mmHg d) 71.63 mmHg 3. a) 100 ml b) 278.4 ml 4. 141.88 ml 5. 121.42 Kelvin 6. 405.9 ml 7. 2.64 atm 8. 0.3598 atm 9. 14.56 ml 10. 3.41 L

3. Unit 10-4 Ideal Gas Law Mathematical relationship between pressure, volume, temperature & number of moles of a gas

4. Ideal Gas Law A combination of Boyle’s, Charles’, Gay-Lussac’s and Avogadro’s Laws A hypothetical state to approximate the behavior of many gases under KMT Use when conditions are set.

5. Ideal Gas Law PV = nRT Pressure (atm) Volume (Liters) # moles Ideal gas constant Temperature (Kelvin)

6. Ideal Gas Constant, “R” R = 0.0821 L·atm mol·K Make sure your P, V, n, and T. is in the same unit as R

7. Ideal Gas Law Example 1 What is the pressure in atm exerted by a 0.5 mol sample of nitrogen gas in a 10 L container at 298 K? –Given:V = 10 LFind:P n = 0.5 mol R = 0.0821 (L·atm)/(mol·K) T = 298 K

8. Ideal Gas Law Example 1 –Given:V = 10 LFind:P n = 0.5 mol R = 0.0821 (L·atm)/(mol·K) T = 298 K –Plan:PV = nRT P = nRT V –Solve:P = (0.5 mol)(0.0821 (L·atm)/(mol·K) )(298 K) 10 L P = 1 atm

9. Ideal Gas Law Example 2 What is the volume, in liters, of 0.250 mol of oxygen gas at 20 °C and 0.947 atm? –Given:P = 0.947 atm Find:V n = 0.250 mol R = 0.0821 (L·atm)/(mol·K) T = 20 °C + 273 = 293 K

10. Ideal Gas Law Example 2 Given:P = 0.947 atmFind:V n = 0.250 mol R = 0.0821 (L·atm)/(mol·K) T = 20 °C + 273 = 293 K Plan:PV = nRT V = nRT P Solve: V = (0.250 mol)(0.0821 (L·atm)/(mol·K) )(293 K) 0.947 atm V = 6.35 L

11. Assignments No Summary Food article due today Online HW (use chrome) Job Notice - Big Arms Swimmers is hiring instructors for the summer at $21/hour in Corona. Let me know if you are interested. Current juniors that would like to be a chemistry lab assistant (T.A.) for next year let me know.

12. Quiz Topics 1.KMT 2.Properties of Gases 3.Combined gas law calculation 4.P, V, T relationship 5.Converting Celsius to Kelvin DON’T FORGET TO DO EXTRA CREDIT