Chem 161-2007 Homework 6
th
Week
Hill & Petrucci Homework Chapter 5
Chem 161-2007 Hill & Petrucci Chapter 5 Homework
Problems: 53,57,59,71,75,79,81,85,89,91,93,94,100,102,110,117
53.
Calculate (a) the volume, in liters, of 1.88 mol of an ideal gas at 55
o
C and 1.08 atm;
(b) the pressure, in atmospheres, of 137 g CO(g) in a 4.49-L tank at 28
o
C; (c) the mass, in
milligrams, of 97.4 mL H
2
(g) at 744 Torr and -2
o
C; and (d) the pressure, in kilopascals, of
19.6 g N
2
(g) in a 6.41-L flask at 0
o
C.
(a) PV = nRT
V = nRT/P
V = (1.88mol x 0.08205Latmdeg
-1
mol
-1
x (273.15+55))/1.08atm
V = 46.9 L
(b) PV = nRT
PV = (g/MW)RT
P = (gRT)/VMW
P = (137g x 0.08205Latmdeg
-1
mol
-1
x (273.15+28))/(4.49L x 28.01gmol
-1
)
P = 26.92 atm
(c) PV = nRT
PV = (g/MW)RT
g = PVMW/RT
g = ((740Torr x (1atm/760Torr)) x 0.0974L x 2.02gmol
-1
)/(0.08205Latmdeg
-1
mol
-1
x
(273.15 – 2))
g = 8.61 x 10
-3
= 8.61mg
(d) PV = nRT
PV = (g/MW)RT
P = (gRT)/VMW
P = (19.6g x 0.08205Latmdeg
-1
mol
-1
x (273.15K + 0K))/(6.41L x 28.02gmol
-1
)
P = 2.45 atm
2.45 atm x (101kPa/atm) = 247 kPa
57.
A hyperbaric chamber is an enclosure containing oxygen at higher-than-normal
pressures used in the treatment of certain heart and circulatory conditions.
What volume
of O
2
(g) from a cylinder at 25
o
C and 151 atm is required to fill a 4.20 x 10
3
L hyperbaric
chamber to a pressure of 2.50 atm at 17
o
C?
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