Problem 19 Learning Goal: To understand several methods of measuring gas pressur
ID: 809439 • Letter: P
Question
Problem 19
Learning Goal:
To understand several methods of measuring gas pressure.
Gases exert a measurable pressure (P) on the walls of their container. The SI unit for pressure is the pascal (Pa). Other pressure units frequently used in chemistry aremillimeters of mercury (mmHg) and atmospheres (atm). You can convert between units of pressure using conversion factors such as those indicated below.
1 atm=760 mmHg=101,325 Pa
art A
On a rainy day, a barometer reads 733mmHg . Convert this value to atmospheres.
Express your answer numerically in atmospheres.
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Part B
A closed container is filled with oxygen. The pressure in the container is 195kPa . What is the pressure in millimeters of mercury?
Express the pressure numerically in millimeters of mercury.
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Part C
What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as shown in the picture? (Figure 1) The atmospheric pressure is 0.95 atm.
Express your answer numerically in atmospheres.
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atmExplanation / Answer
Answer 1)
Because m 760~mmHg=1~atm the conversion factors are: large{ m rac{1~atm}{760~mmHg}} or large{ m rac{760~mmHg}{1~atm}} To make sure that you use the conversion factor correctly, always check the units. The initial units should cancel, and the new unit should stay in the numerator.
ans = 0.978 m atm