How to Use the Ideal Gas Law in Two Easy Steps


ideal gas law The ideal gas law compares
pressure, volume, moles and temperature. and there’s a gas constant known as R. Now know this! All of your units should be atmospheres for pressure, liters for
volume, n is moles and our gas constant which is R is this value with liters
times atmospheres all divided by moles times Kelvin and our temperature is
always in Kelvin. Now that you know this, let’s move on to our example. What volume
does 0.556 moles of gas occupy at a pressure of 715 millimeters mercury and
a temperature of 58 degrees Celsius. Let’s identify our given and what we’re
finding. Our given is moles, pressure, and temperature. And we’re finding volume. Step 1, convert to your proper units. Using our temperature in Celsius we want
to convert this to Kelvin. We’ll add 273 to get 331 Kelvin. Now
let’s change our pressure into atmospheres Remember, one atmosphere
equals 760 millimeters mercury. This is our conversion factor that will allow us
to get from millimeters mercury to atmospheres. atmospheres we’ll align the millimeters
mercury so they can cancel and we’ll be left with just atmospheres. After we
divide these two values we get. Our new pressure in the proper units. Step 2, plug
it into your formula of PV=nRT. We’ll plug in our pressure in the proper
units of atmospheres. then we’ll multiply that pressure by our V or our volume, set
this equal to our n or our moles. Then multiply it by R which is our gas
constant which is this value and lastly we’ll plug in our temperature which is
in Kelvin. Next multiply each one of these values. Now that we’ve multiplied the
right hand side out. we want to divide this over to get V by itself after we
divide these two values together we get 16.05 but we want to
round to three sig figs since our original given values were exactly three
sig figs. Our final answer is 16.1 Liters. Ideal gas law, I think you guys got it. I have a bunch of resources linked up in
the description box. Also I do live weekly tutoring sessions to answer all
of your questions so turn on the notifications to know when I’m going
live and if you learn something today like and subscribe and you know I don’t
know about you but I could use a break thank you guys so much for watching this
was an amazing video to film it was so much fun to incorporate my love for
chemistry and as you can tell my love for dance. This is a different format I
know and I want to know did you like it leave a comment below letting me know
what is your thought overall about the video and remember every day is a new
opportunity to work towards your goal.

Author Since: Mar 11, 2019

  1. Hi Melissa, I've been learning a lot from you and I really appreciate your teaching style.

    Can you please help me understand the difference between the average oxidation number of an atom in a compound, vs the oxidation number of each atom?

  2. Loved the video format! So fun! I’m not here yet in my chem class but when I get here I have this to refer back to 🙂

  3. I really enjoy your channel, Melissa! Thank you so much for sharing your knowledge. It would be great if you created a High School Chemistry playlist!

  4. Hi Melissa! Thank you for creating this channel!❤ Your videos are super AWESOME! And you are super helpful and easy to follow when you explain steps.
    Could you possibly make a video working out some problems dealing with the Photoelectric effect?

  5. You’re so helpful whenever i am looking for help in chem your my gal and i have a test tomorrow of gas law so im a little late

  6. Hey Melissa! I absolutely love ALL of you videos. They are super helpful, however, I have a question. What would I do if I were to calculate a volume in milliliters, starting with a given that starts in milliliters?
    Thanks!

  7. Great video. While I have a doctorate I still dream that I am high school. I am always learning, so can't wait to watch more of your videos.

  8. Love the video format, the different colours, some videos are longer and thats nice this one is shorter and its nice too as i can just rewatch it, love the dancing!
    I do really appreciate the time put into making these videos, it is really helpful to me the concise and to the point way you explain things, I really like everything important written down as you say it as i think it helps memorizing it too. giving everything thumbs up and watching all ads just to support you in any way i can, also bought a set of your notes from the shop! Thank you and please please please continue to make content, Im recommending your channel to my classmates at uni as well

  9. Your channel is so great. I have a test tomorrow and your channel is a great review and helps me when I miss a day and don’t want to be lost the next day.

  10. These videos have become a life saver. As an mechanical engineering major, chem is chinese to me. These videos are keeping me afloat.

  11. Great video Melissa! But I have a question, How did you get 15.1019? I tried multiplying each one like you said but I keep getting different answers. Can you please tell me how you got that.

  12. This video is great; my students really appreciate these videos! Is there any video showing the other R values such as 62.4 for torr, or 8.314 for kPa?

  13. You are a blessing I sware! Thank you so much! I am struggling with this chapter. Now, all I need to do is more practice. Wish I would've found you before this semester started with Chemistry 1.

  14. To find the volume could you just multiply the moles you have with 22.41L/1 mol and wouldn’t that be the answer for volume?

  15. OMG, The way of Teaching is really Amazing, Iam Shocked After watching the video, My Words arent enough to Praise your Work .😍 So Much love and Respect. Keep it up.

  16. Hi Melissa,
    How did you know to round the temp in Kelvin to the nearest whole number? and how did you know how many sig. figures to use for atm? Thank you.

  17. Trying to help my teenager with his homework, your video just saved me. Thank you so much for the clear, simple, and concise presentation.

  18. I think you are a very talented young lady! right on for you Melissa! you Rock and you know your Chemistry. Thanks

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