A gas occupying a volume of 725 mL at a pressure of 0.970 atm is allowed to expa
ID: 525631 • Letter: A
Question
A gas occupying a volume of 725 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
(5 points)
(Reference: Chang 5.19)
The volume of a gas is 5.80 L, measured at 1.00 atm. What is the pressure of the gas in mmHg if the volume is changed to 9.65 L? (The temperature remains constant.) (5 points)
(Reference: Chang 5.21)
NO WRITTEN ANSWERS!
Why is the density of a gas much lower than that of a liquid or solid under atmospheric conditions? What units are normally used to express the density of gases? (5 points)
(Reference: Chang 5.30)
Explanation / Answer
Q1.A gas occupying a volume of 725 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
V1 = 725 mL , P1 = 0.97 atm, P2 = 0.541 atm, V2 = ?
P1*V1 = P2*V2
725*0.97 = 0.541 * V2
V2= 725*0.97/0.541
V2 = 1299.907 mL
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