Activity 21- Ideal Gas Law A: Ideal Gas Law Label each term in the ideal gas law

Question

Activity 21- Ideal Gas Law A: Ideal Gas Law Label each term in the ideal gas law and indicate the units that should be used in the equation if using nits of moler for the gas constant not-K B: Demonstration Predictions and Observations For each of the following demonstrations, predict how the described changes will affect other variables. Circle predictions for dependent variables. for increasing, for unchanged,for decreasing. Description A balloon filled with 10 L of helium gas is cooled from room temperature (298K) using liquid nitrogen (77K). What is the final volume of the balloon? A balloon filled with 200mL of air is placed in a bel jar at a pressure of 1.0 atm. A vacuum pump is used to reduce the pressure in the bell jar to 0.01 atm. What is the final volume of the balloon? A balloon at 1.0 atm and 298K has an initial volume of 2.0L. Calculate the volume of the balloon after the addition of 0.10 mol of air. The air in the enclosed side of a manometer is warmed from 25°C to 37°C, How will the pressure of the gas change?

Explanation / Answer

Using the ideal gas law , pV = nRT , the changes in the other variables can be predicted , when the conditions of the system change.

So here :

1 ) temperature is decreased So :

p decreases

V decreased

n = unchanged

2) Pressure is reduced , so :

V increases

n = unchanged

T = decreases

3) Air is added , so :

p increases

V increases

n increases

T decreases

4) Temperature is increased

p is increased

V is increased

n is unchanged

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