Mass An experiment was designed as shown in the figure. A container with a leak-

Question

Mass An experiment was designed as shown in the figure. A container with a leak-proof, movable piston top was filled with a gas. During the experiment, heat was applied to the apparatus using a Bunsen burner Answer the following questions about the experiment. 1. Identify the variables in the Ideal Gas Law that are being held constant and those that are changing in this experiment Temp. Press. 2. Is the relationship between volume and temperature direct or indirect? Explain. At the experimental conditions shown, calculate the volume of the container? Assume 0.100 moles of gas is in the container, R= 0.08206 Laon mol-K, units for temperature is Kelvin and pressure is atm. 3.

Explanation / Answer

Q1.

if movable piston, then it will experience the pressure of ambient atmosphere

therefore,

P1 = atmospheric, P2 = atmospheric

Q2.

the ratio is

V1/T1 = V2/T2

or

V1*T2 = V2*T2

this is inversely proportional

or "indirect" since increase of T implies increase of V

Q3

Apply ideal gas law

PV = nRT

T = 350 K, P = ?, V = 3.8 L approx (from the diagram)

then

P = nRT/V = (0.1)(0.082)(350)/(3.8) = 0.7552 atm

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