UNIT 10 - GASES

THE IDEAL GAS EQUATION (p. 434 436 in text book)

P V = n R T

"P" stands for __________________, must be in units of __________________

"V" stands for __________________, must be in units of __________________

"n" stands for __________________, must be in units of __________________

"T" stands for __________________, must be in units of __________________

"R" stands for the Ideal Gas Constant  , has a value of 0.0821 with units of   L . atm 
                                                                                                      mole . K

EXAMPLE 1:
Q: 
What pressure is exerted by 0.325 moles of hydrogen gas in a 4.08 L container at 35 oC?
A:   P V = n R T       solving for P ...                  
P = n R T
         V
n = 0.325 moles (correct unit), T = 35 oC (need to convert to K), V = 4.08 L (correct unit)
T = 35 oC + 273 = 308 K
P = (0.325 moles) (0.0821 L atm/mole K) (308 K) = 2.01 atm
                             (4.08 L)

EXAMPLE 2:
Q: 
What mass of chlorine gas, Cl2, in grams, is contained in a 10.0 L tank at 27 oC and 3.50 atm
of pressure?                                                (Answer: 101 grams)

 

EXAMPLE 3:
Q:
  A gas at 20.0 oC and 3.98 atm contains 1.45 moles of gas particles.  What volume does
      the gas occupy?                                                         (Answer: 8.77 L)

 

 

 

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