Recent content by Zaros

Homework Statement You are given a white powder and it could be one of six substances: calcium carbonate, calcium sulfate, sodium hydrogen carbonate, sodium carbonate, sodium chloride and sodium hydroxide. Determine the unknown sample. Materials: White powder (5g) Phenolphthalein Silver...

Ok yes that's good idea to keep them all the same. Hopefully your buddy will be able to help as all my searching has just come up with using differentiation with some of the equations which seems way ahead of what we have been doing so far in this unit. I could probably do it myself using this...

Okay iv gone back through all my working replacing the values and the new answers I got were: a) \DeltarxnH\circ=182kJ/mol b) T>8.39*102k c) k=e-16.9=4.50*10-8 I've only written up the values that have changed as everything else will have remained the same as my original posts. Still...

ahh thanks for that. Good job you picked up on it. Ill get back to you once I've sorted it out

I have managed to solve part (c) not sure if its correct though. c) \DeltaG\circ= -2*-59 =118kJ/mol =118,000 J/mol (-\DeltaG\circ)/(RT) = (-118000)/(8.314*1.4*103) = -10.1 k=e-10.1=3.96*10-5 Im still having trouble with part (d) though as I am unsure what...

can anyone help?

Homework Statement Pure oxygen was first obtained in the laboratory by the French scientist Antoine Lavoisier in the 18th century by decomposing red mercury(II) oxide, HgO, to give silver mercury liquid and gaseous oxygen: 2HgO(s) \Leftrightarrow 2Hg(l) + O2 (a) From values of \Delta f...

then should i use the F= (G*m1*m2)/r2 instead so that would lead to F= 1/2 mv2 + h((G*m1*m2)/r2) Now is this correct?

W = KE + PE = 1/2 mv2 + mgh Is that right?

i think i must be doing something wrong. Is V1 = V2 if not what should it be. Also if i try this i get 3011370600 Pa which is outrageously big. For part a i got a speed of 2.65 * 103 m/s any ideas what i did wrong

Work is equal to kinetic energy i.e. W= 1/2 mv2 Is that what your getting at?

Homework Statement A scientist wants to put an 100kg experimental package in orbit around the Earth. The cost of deployment depends on the amount of extra energy it takes to get it into the required position i.e. how much more energy is used than just sending the rocket up there. a)...

Great thanks for this you really helped. I was wondering how to use Bernoulli's equation but never thought that the second pressure would be that of the atmosphere. Thanks. Zaros

Is anyone able to help with this problem. I may be getting at it from the wrong direction so you might want to disregard some of the equations I'v used.

No I didn't expect them to move by much so thought this value would be about right. Thanks for all the help. Zaros