1. If oxygen is collected over water at 15 C and 765 mmHg , what is the partial
ID: 508497 • Letter: 1
Question
1. If oxygen is collected over water at 15 C and 765 mmHg , what is the partial pressure of the oxygen? Refer to the table below for the vapor pressure of water.
2. A sample of hydrogen chloride gas occupies 0.500 L at STP. What is the pressure in atm if the volume is 0.125 L at 30 C?
TABLE 10.2 VAPOR PRESSURE OF WATER TEMPERATURE (C) PRESSURE (mm Hg) TEMPERATURE CC) PRESSURE (mm Hg) 6.5 118.0 149.4 10 60 12.8 65 15 187.5 17.5 70 20 233.7 289.1 75 80 355.1 31.8 41.2 433.6 90 55.3 525.8 95 633.9 71.9 50 92.5 100 760.0Explanation / Answer
(1)
Partial pressure of O2 = total pressure - vapour pressure of water
= 765 - 12.8
= 752.2 mm Hg
(2)
Formula,
P1V1 / T1 = P2V2 / T2
given that, P1 = 1 atm
V1 = 0.500 L
T1 = 273.15 K
P2 = ?
V2 = 0.125 L
T2 = 303.15 K
Therefore,
1 * 0.500 / 273.15 = P2 * 0.125 / 303.15
P2 = 4.44 atm
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