Locker Number print name first Experiment 14 PRELIMINARY EXERCISES: The Combined

Question

Locker Number print name first Experiment 14 PRELIMINARY EXERCISES: The Combined Gas Law and Dalton's Law 1. Consider a mixture of oxygen and nitrogen. The oxygen gas exerts a pressure of 0.68 at and the nitrogen gas, 1.20 atm. What is the pressure exerted by the mixture of the two gases? Total pressure 2. The term vapor and gas mean the same. Historically, vapor referred to the gas formed as a liquid evaporated. Water vapor is water in the gaseous state, a gas, Hous. Air in contact with liquid water will become saturated with water molecules (water vapor). The higher the temperature of the liquid water, the higher the concentration of water molecules in the air and the higher the pressure exerted by this water vapor. Which of the gas laws can be used to subtract the pressure exerted by water molecules from the total pressure of a gaseous mixture? Besides naming the law, state it in and as an equation 3. What is the vapor pressure of water at 25°C? At 300C? Where would you look to find these values? Vapor pressure at 25°C Vapor pressure at 30 C 4. Suppose you collected oxygen gas over water, allowing it to be saturated with water vapor. The total pressure of the oxygen plus water vapor equals 750.5 torr at 25°C. What is the pressure exerted by only the oxygen molecules? oxygen pressure (The Preliminary Exercises continue on the following page.)

Explanation / Answer

1. Total pressure= sum of partial pressure of each individual gas.

Total pressure= Poxygen + Pnitrogen

   = 0.68 atm + 1.20 atm

= 1.88 atm

Answer: total pressure exerted by the mixture= 1.88 atm

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