Day 5 – Notes. Unit: Gas Laws. Dalton’s Law of Partial Pressures, Grahams Law, and Real vs. Ideal Gases. After today you will be able to…. Describe Dalton’s law of partial pressures and calculate P total or a partial pressure
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“The total pressure of a mixture of gases is equal to the sum of the individual (partial) pressures.”
Units of pressure must match!
Ptotal= P1 + P2 + P3…
What is the total pressure for a mixture of O2 and CO2 if PO2= 0.719 atm and PCO2= 423mmHg.
Ptotal=546mmHg + 423mmHg
“The rate of effusion of a gas is inversely proportional to the square root of the gas’s molar mass.”
Always place the larger molar mass in the numerator!
Rate B √MMA
Which gas effuses faster, H2 or Cl2? How much faster?
H2 effuses 5.92x faster than Cl2