1) One mole of an ideal gas is sealed in a 22.4-L container at a pressure of 1 a
ID: 1011117 • Letter: 1
Question
1) One mole of an ideal gas is sealed in a 22.4-L container at a pressure of 1 atm and a temperature of 273 K. The temperature is then increased to 309 K , but the container does not expand. What will the new pressure be? P2=____
2) A cylinder with a movable piston contains 2.00 g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 L to 3.70 L ? (The temperature was held constant.)
Explanation / Answer
1) at constant (V) , P1/T1 = P2/T2
P2 = 1 atm * 309 K / 273 K = 1.13 atm
2) Given: P1 = P2 and T1 = T2 (both constant)
V1 / m1 = V2 / m2
Given:
V1 = 2.00L
m1 = 2.00 g
V2 = 3.70L
m2 = (3.7 L x 2.00 g) / 2.00 L
= 3.70 g
The mass added = m2 - m1
= 3.70 g - 2.00 g
= 1.70 g of He
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