A 0.0020 mol sample of gas is held in a 1.0 L cylinder at 1 atm pressure and 20

Question

A 0.0020 mol sample of gas is held in a 1.0 L cylinder at 1 atm pressure and 20 C. The cylinder is sealed with a piston, which allows for changes in volume and pressure. Pick correct choice and explain it. (a) If the pressure on the cylinder increases, the temperature of the gas decreases, and all other conditions remain the same, the volume the gas occupies will: increase, decrease, unable to determine without more information (b) If 0.001 mol of gas is removed, the temperature of the gas decreased, and the volume held constant, the pressure of the gas will: increase, decrease, unable to determine without more info (c) If the volume of the gas increases, and the temperature increases, and the number of moles is constant, the pressure of the gas will: increase, decrease, unable to determine without more info

Explanation / Answer

we have relation PV = nRT

a) P increased , T is decreases , then Volume of gas decreases

Volume is directly proportional to temp ( Charles law) hence decrease in T cause decrease in V.

Volume is inversely proportional to Pressure ( Boyles law) hence increase in P causes decrease in V

b) as moles of as removed P decreases and as Temp decreases P decreases

hence overall Pressure decreases

c) increase in T causes increase in P ( Charles law)

Increase in vol cause decrease in P ( Boyles law)

so overal change in P caanot be determined without more info

If we have initial and final V , T , values we can predict the change in P

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