1 Answers

If the quantity of oxygen occupying 2.76L container at a…

Posted by: 224 views ,
CHEMISTRY

QuizTablet Community!

If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?

A. 1.650atm

B. 0.825atm

C. 0.413atm

D. 0.275atm

QUICK ANSWER…

C

DETAILS…

Please observe that the volume of the container and the temperature remained constant, only the quantity (moles) and the pressure are changing. We have a formula in mind:

PV = n RT

P = n RT/V

Therefore, P/n = RT/V

P/n = constant

Where P = pressure,

T = temperature,

V = volume,

R = gas constant, and

n = number of moles also taken as the quantity.

Now, since P/n = constant, it implies that P1/n1 = P2/n2

Where P1 is given as 0.825atm

P2 = unknown = ?

 Also, let n1 = A

And since the quantity was said to have reduced by half, n2 = A/2 =

Substituting these values into the equation, we have:

P1/n1 = P2/n2

0.825/A = P2/(A/2)

(0.825/A) × (A/2) = P2

Therefore, P2 = 0.825/2 = 0.4125 = approximately 0.413atm

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is correct.
  4. D is not the correct answer.
RELATED!  The height at which the atmosphere ceases to exist is about 80km...

KEY-POINTS…

You may please note these/this:

  • There is a short cut, since P and n are directly proportional, a decrease in P will also cause a decrease in n in the same measure.
  • A decrease in n by half will trigger a decrease in P by the same half, hence, we can quickly see that P2 = half of P1.

You can login to improve on these Answers, at QuizTablet.com anyone can improve our Answers to assist our future learners…

You can also click the golden ASK A QUESTION BOTTON down this page to raise new related questions… OUR COMMUNITY OF EXPERTS WILL BE MORE THAN HAPPY TO TACKLE IT…

/ culled from 2020 JAMB-UTME chemistry past question 13 /

If the quantity of oxygen occupying 2.76L container at a... » QuizTablet
If the quantity of oxygen occupying 2.76L container at a... » QuizTablet

CHEMISTRY SHORT-CLASS!!!

Course Provider: Organization

Course Provider Name: N.D Sammy

Course Provider URL: https://quiztablet.com/about-quiztablet-community/

Editor's Rating:
8.3

1 Answers

  1. 0 Votes Thumb up 0 Votes Thumb down 0 Votes

    Feel free to ask us questions on this topic, we will respond in minutes…

    Admin - May 31, 2021 | Reply


Answer Question