A 550. mL sample of gas at 2.00 atm of pressure is compressed to a volume of 400

Question

A 550. mL sample of gas at 2.00 atm of pressure is compressed to a volume of 400. mL. What is the pressure on the compressed sample? a. 2.09 times 10^5 atm b. 0.362 atm c. 4.78 times 10^-5 atm d. 2.75 atm e. none of these How many moles are present in a 2.00 L sample of gas at 30 degree C and 0. 821 atm? (R = 0.0821 L.atm / mol.K.) a. 18.5 mol b. 1.50 mol c. 0.667 mol d. 6.60 times 10^-2 mol e, none of these For which of the samples listed below will the average molecular speed be greatest? a. N_2 at 400 K. b. N_2 at 300 K. c. SO_2 at 400 K d. SO_2 at 300 K e. all of these gases have the same average speed

Explanation / Answer

Q2.

V1 = 550 mL of gas, P1 = 2 atm

V2 = 400 mL then, P2 = ?

Apply idal gas law ratios

P1V1 = P2V2

substitute

2*550 = P2*400

P2 = 2*550/400

P2 = 2.75 atm

pressure increases, since volume is decreased

choose D

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