Sunday

August 31, 2014

August 31, 2014

Posted by **Katy** on Tuesday, May 4, 2010 at 9:49pm.

I am not sure what equations to use for this problem....

- Physics -
**Damon**, Tuesday, May 4, 2010 at 10:00pmPV=nRT

p dV + V dp = n R dT

p is constant here so

p dV = n R dT

work = integral p dV = nR dT

p(V2-V1) = n R (T2-T1)

so 15 = n R (T2-T1)

- Physics -
**Katy**, Tuesday, May 4, 2010 at 10:06pmdoesnt that give me an answer in moles? ...is there a way to convert moles to mg?

- Physics -
**Katy**, Tuesday, May 4, 2010 at 10:12pmso i got the answer to be .01804 moles

and i know one mole of helium is 4.03 g

do i just multiply the two together? and then divide by 10000 to convert g to mg?

- Physics -
**Katy**, Tuesday, May 4, 2010 at 10:14pmnever mind. I made a silly error.

i got .01804 moles...multiplied that times 4.03grams and then multiplied that times 1000 and got 72.7mg.

got it! thanks so much!

- Physics -
**?Unknown?**, Wednesday, May 5, 2010 at 9:19pmwhat are we solving for in this equation?? 15 = n R (T2-T1)

we know n, we know R, we know t1 and t2...so what do we solve for?

**Related Questions**

Physics - A sample of helium behaves as an ideal gas as it is heated at constant...

physics - One kilogram of an ideal gas is heated from 27*C to 327*C. If the ...

Physics - A sealed container of volume 0.10 m3 holds a sample of 3.0 x 10^24 ...

thermodinamics - 2. A sample of an ideal gas underwent an expansion against a ...

Physics - A container having a volume of 1 m3 holds 90 mol of helium gas at 176...

Physics HELP!!!!!!!! - Suppose 0.021 mole of an ideal monatomic gas has a ...

Chem - A balloonist is preparing to make a trip in a helium-filled balloon. The ...

Chem hw! - 1. What pressure would be needed to compress 25.1 mL of hydrogen at 1...

Chem hw! - 1. What pressure would be needed to compress 25.1 mL of hydrogen at 1...

Physics - A certain type of ideal gas at pressure p0 is contained in a plugged ...