Recent content by RJWills

Okay so pV=nRΔT but this is only useful if I assume a value for n such as 1 right? And should I use the final volume after expansion? With my multiplication should it be +20^5J because the gas is expanding therefore there is positive work being done on the surroundings?

I know this question has been done to death and I have had a look through past questions on this forum and others but I can't find anything that is helpful to this particular question! Homework Statement An ideal monatomic gas expands reversibly at a fixed pressure of 10^5 Pa from a...

Homework Statement "By applying Gibbs' phase rule to show that for an n component system, no more than n+2 phases may coexist at equilibrium Homework Equations P+F=C+2 The Attempt at a Solution Because the question says that P = n +2 I subbed this in => n+F=C. I'd like to sub...

Sorry to beat the question to death but I'm a bit confused now. So should my Temperature Volume graph should look like the pV graph with a steeper middle isotherm? Or should it have two flat isotherms (1st at 1000K, the second at the decreased T1) with a steep isotherm between the flat parts...

With the adibatic path do you mean a greater rate of decline in pressure with increase in volume? Or have I misunderstood the concept? Also with the adiabatic expansion, because U=3/2 nRT, that a decrease in U, would be a result of a decrease in T since R is a constant and n is kept the same...

Okay so I've been have a good think about radiators and how they work, in particular the fact that conventionally they work via convection with a bit of radiation at normal temperatures. But say my radiator is made out of some fancy metal that can withstand extreme temperatures, if I to say...

Homework Statement "In the following a<b<c are finite positive constants. One mole of an ideal monoatomic gas, initially at volume Vi and temperature 1000K, expands to a final volume cVi in 3 reversible steps: (1) isothermal expansion from Vi to aVi (2) adiabatic expansion from aVi to bVi (3)...

Is it that I've used cm-3 instead of m-3 which I would have to use because of the standard units to calculate pressure?

Just a quick check of my answer, hope you don't mind: dp/dT=(ml)/TΔv = 333/ 273*(-0.0905125) = -13.48 atm/ K I have assumed that this is for 1g of water.

:smile: Got it! I wish I had been more of a pain in the backside to the lecturer when he was writing down notes. He would never reference what the meaning of the symbols, just write them down. 1st year undergrads, be annoying to lecturers. I sure as hell know I'm going to be annoying next year!

Awesome thanks for the help guys :)

I meant to put Clapeyron equation, auto correct had other ideas... Homework Statement The densities of ice and water are 0.917 g cmE-1 and 1.00 g cmE-1 respectively. The latent heat of fusion of ice is 333 J gE-1. Use this information to derive the slope dp/dT of the water-ice coexistence...

Okay so tried it the way you suggested, here's what I did: 500(L1α1+L2α2) +L1+L2 = 1.005(L1+L2) 1.011L1 + 1.0045L2 = 1.005(L1+L2) Therefore L1/L2 = 1/12 (0.0833...) right?

Homework Statement "A composit bar is made of two metals joined in series, with coefficients of linear thermal expansion 2.2E-5 and 0.9E-5 K^-1 respectively. The bar expands by 0.5% in length with a temperature rise of 500 K. Calculate the ratio of the initial lengths of the two metal...

As you say, I have included it in my working, i just miss typed what I have written on paper. The diagram is included in the textbook question. Still really confused and I cannot see how to solve this. Edit: HURRAY SOLVED IT! I was thinking of it as R-0.01g= xyz where as it should be...