Partial pressure of a gas is the pressure

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1. Partial Pressure The partial pressure of a gas is the pressure that each gas in a mixture would exert if it were by itself in the container. Core Chemistry Skill Calculating Partial Pressure

2. Dalton’s Law of Partial Pressures Dalton’s law of partial pressures indicates that pressure depends on the total number of gas particles, not on the types of particles. the total pressure exerted by gases in a mixture is the sum of the partial pressures of those gases. P T = P 1 + P 2 + P 3 + ....

3. Total Pressure The air we breathe is a mixture of different gases. contains mostly N 2 and O 2 , and contains small amounts of other gases. What we call the atmospheric pressure is actually the sum of the partial pressures of the gases in the air

4. Guide to Solving for Partial Pressure

5. Solving for Partial Pressure A scuba tank contains O 2 with a pressure of 0.450 atm and He at 855 mmHg. What is the total pressure in mmHg in the tank (volume and temperature are constant)? STEP 1 Write the equation for the sum of the partial pressures. P total = P O 2 + P He STEP 2 Rearrange the equation to solve for the unknown pressure. Convert units to match. P total = P O 2 + P He  

6. Solving for Partial Pressure A scuba tank contains O 2 with a pressure of 0.450 atm and He at 855 mmHg. What is the total pressure in mmHg in the tank (volume and temperature are constant)? STEP 3 Substitute known pressures and calculate the unknown partial pressure. P total = P O2 + P He P total = 342 mmHg + 855 mmHg = 1.20 x 10 3 mmHg  

7. Study Check For a deep dive, a scuba diver uses a mixture of helium and oxygen with a pressure of 8.00 atm. If the oxygen has a partial pressure of 1280 mmHg, what is the partial pressure of the helium (volume and temperature are constant)? A. 520 mmHg B. 2040 mmHg C. 4800 mmHg

8. Solution For a deep dive, a scuba diver uses a mixture of helium and oxygen with a pressure of 8.00 atm. If the oxygen has a partial pressure of 1280 mmHg, what is the partial pressure of the helium (volume and temperature are constant)? STEP 1 Write the equation for the sum of the partial pressures. P total = P O 2 + P he STEP 2 Rearrange the equation to solve for the unknown pressure. Convert units to match. P He = P total − P O 2 ×

9. Solution For a deep dive, a scuba diver uses a mixture of helium and oxygen with a pressure of 8.00 atm. If the oxygen has a partial pressure of 1280 mmHg, what is the partial pressure of the helium (volume and temperature are constant)? STEP 3 Substitute known pressures and calculate the unknown partial pressure. P He = 6080 mmHg – 1280 mmHg = 4800 mmHg or 4.80 × 10 3 mmHg The answer is C, 4800 mm Hg.