1) A gas sample has a volume of 4250 mL at 20. ?C and 750. mmHg . What is the fi

Question

1) A gas sample has a volume of 4250 mL at 20. ?C and 750. mmHg . What is the final temperature, in degrees Celsius, after the sample is transferred to a different container with a volume of 2.90 L and a pressure of 1.40 atm when n is constant Express your answer using two significant figures.

2)The air in a 4.50 L tank has a pressure of 1.10 atm . What is the final pressure, in atmospheres, when the air is placed in tanks that have the following volumes, if there is no change in temperature and amount of gas?

3000. ML

780 ML

9.10 L

Explanation / Answer

1)
Given:
Pi = 750 mm Hg
= (750/760) atm
= 0.9868 atm
Pf = 1.4 atm
Vi = 4250 mL
= (4250/1000) L
= 4.25 L
Vf = 2.9 L
Ti = 20.0 oC
= (20.0+273) K
= 293 K

use:
(Pi*Vi)/(Ti) = (Pf*Vf)/(Tf)
(0.9868 atm*4.25 L)/(293.0 K) = (1.4 atm*2.9 L)/(Tf)
Tf = 283.6332 K
Tf = 283-273 oC
Tf = 10 oC
Answer: 10 oC

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