J.R. S. answered • 05/02/20

Ph.D. University Professor with 10+ years Tutoring Experience

I'm sorry that you missed school, but I'm not going to do all these problems. I will do a couple and hopefully get you started so that you can do the others. Good luck.

*Start by memorizing the Ideal Gas Law which is PV = nRT *

P = pressure in the appropriate units

V = volume in liters

n = moles

R = gas constant (usually 0.0821 Latm/Kmol) but there are other values with different units. Depends on units of pressure.

T = temperature in Kelvin

Also, from this Ideal Gas Law equation, you can derive all the other relationships, such as

P1V1 = P2V2

P1/T1 = P2/T2

P1V1/T1 = P2V2/T2

etc.

(1) V1 = 7.62 L

n1 = 2.45

V2 = 5.25 L

n2 = ?

Use V1/n1 = V2/n2

7.62 L/2.45 mol = 5.25 L/n2 mol

n2 = 1.69 moles left

(3) V1 = 15.0 L

T1 = 22ºC + 273 = 295 K (remember to always use Kelvin)

P = 754 mm Hg

V2 = 23.0 L

P2 = 723 mm Hg

T2 = ?

Use P1V1/T1 = P2V2/T2

rearrange and solve for T2:

T2 = P2V2T1/P1V1 = (723)(23)(295) / (754)(15)

T2 = 434K

If you want the new temperature in ºC, we subtract 273 to get 161ºC

Good luck with the others.