1. The Ideal Gas Law PV=nRT  P = Pressure  V = Volume  n = Number of Moles  R = ideal gas constant  T = temperature in Kelvin PV=nRT  P = Pressure  V = Volume  n = Number of Moles  R = ideal gas constant  T = temperature in Kelvin

3. R -The ideal gas constant  Depends on unit of pressure  0.0821 L. Atm / K. mol  62.4 L. mmHg / K. mol  8.31 L. kPa / K. mol  Depends on unit of pressure  0.0821 L. Atm / K. mol  62.4 L. mmHg / K. mol  8.31 L. kPa / K. mol

4. Ideal Gas Law example problem  Calculate the pressure of 1.65 g of helium gas at 16.0 o C and occupying a volume of 3.25 L?  You will need g to moles and Celsius to Kelvin:  1.65 g He 1 mole He  4.0 g He = 0.412 mol He  K = o C + 273 ; 16. 0 + 273 = 289 K  For this problem you will need to pick an R value. For this problem I will choose to use the R value containing kPa. I picked it. You can’t do anything about it. So; just try and stop me.  Plug and Chug baby, get ‘R done. Do it. Come on I dare ya.  Calculate the pressure of 1.65 g of helium gas at 16.0 o C and occupying a volume of 3.25 L?  You will need g to moles and Celsius to Kelvin:  1.65 g He 1 mole He  4.0 g He = 0.412 mol He  K = o C + 273 ; 16. 0 + 273 = 289 K  For this problem you will need to pick an R value. For this problem I will choose to use the R value containing kPa. I picked it. You can’t do anything about it. So; just try and stop me.  Plug and Chug baby, get ‘R done. Do it. Come on I dare ya.

5. Ideal Gas Law example problem  P x 3.25 L = 0.412 mol x 8.31 kPa. L x 289 K  mol. K  Do the algebra and solve; if you do it right, guess what? You get the answer right. Neat concept, huh?  = 304 kPa  Your turn  How many moles of gas are present in a sample of Argon at 58 o C with a volume of 275 mL and a pressure of 0.987 atm.  P x 3.25 L = 0.412 mol x 8.31 kPa. L x 289 K  mol. K  Do the algebra and solve; if you do it right, guess what? You get the answer right. Neat concept, huh?  = 304 kPa  Your turn  How many moles of gas are present in a sample of Argon at 58 o C with a volume of 275 mL and a pressure of 0.987 atm.

6. Ideal Gas Law example problem  Answer  0.987 atm x 0.275 L = n x 0.0821 L. Atm x 331K  mol. K  Do the dew; oops, I mean the algebra and presto; the answer with the correct number of sig figs is..  Do you know how to keep a so called chem student in suspense?  Do ya?  = 0.00999 mol Ar  Congrats - you can plug and chug.  Bye Bye now.  Answer  0.987 atm x 0.275 L = n x 0.0821 L. Atm x 331K  mol. K  Do the dew; oops, I mean the algebra and presto; the answer with the correct number of sig figs is..  Do you know how to keep a so called chem student in suspense?  Do ya?  = 0.00999 mol Ar  Congrats - you can plug and chug.  Bye Bye now.