no hand written answers! A sample of nitrogen gas kept in a container of volume
ID: 525632 • Letter: N
Question
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A sample of nitrogen gas kept in a container of volume 2.3 L and at a temperature of 32°C exerts a pressure 4.7 atm. Calculate the number of moles of gas present. (8 points)
(Reference: Chang 5.31)
What volume will 5.6 moles of sulfur hexafluoride (SF6) gas occupy if the temperature and pressure of the gas are 128°C and 9.4 atm? (8 points)
(Reference: Chang 5.33)
A gas-filled balloon having a volume of 2.50 L at 1.2 atm and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are –23°C and 3.00 × 10–3 atm, respectively. Calculate the final volume of the balloon. (8 points)
(Reference: Chang 5.35)
Explanation / Answer
Question 1- A sample of nitrogen gas kept in a container of volume 2.3 L and at a temperature of 32°C exerts a pressure 4.7 atm. Calculate the number of moles of gas present. (8 points)
N2 gas...
V1 = 2.3 L, T = 32°C = 32+273 = 305 K, P = 4.7 atm
caluclate moles
use ideal gas law
PV = nRT
n = PV/(RT)
n = (4.7*2.3)/(0.082*305)
n = 0.43222 moles
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