pressure

  1. T

    Partial pressure and Gibbs free energy

    Hi everyone, i'm given the equation in the red zone in my attempt: NH4Cl<=>NH3+HCl at a temperature of 298K. I have to calculate what the partial pressure of HCl will be at the equilibrium of this reaction, starting only with NH4Cl in an closed room. In order to do this, I have to first...
  2. G

    KNO3 solidification under increased pressure?

    I used a blender to mill the potassium nitrate granules into finer powder, which worked just fine except that some of the KNO3 got between the rotating knife and the container's pivot. (See picture...
  3. P

    Determining partial pressure

    Ammonium hydrogen sulfide, a solid, decomposes to give NH3(g) and H2S(g). At 25°C, some NH4HS(s) is placed in an evacuated container. A portion of it decomposes, and the total pressure at equilibrium is 0.659 atm. Extra NH3(g) is then injected into the container, and when equilibrium is...
  4. B

    Finding the molar mass from an Osmotic Pressure

    An unknown, non-ionizing compound with a mass of 0.108 g is dissolved in water to make 100.0 mL of solution. If the solution has an osmotic pressure of 0.169 atm at 20.8 ºC, what is the molar mass of the substance? -------- The answer is 154.1g/mol. I got this question wrong and can't figure...
  5. K

    Calculating PV work done at atmospheric pressure?

    I need some help figuring out this problem. This is the original problem: How much PV work is done in kilojoules for the reaction of 3.74 mol of H2 with 1.87 mol of O2 at atmospheric pressure if the volume change is −23.9L? And we are given this reaction: The reaction between hydrogen and...
  6. S

    Oxygen pressure for oxidizing gold problem

    Hi Guys! I'm not sure what to do, I don't epect anyone to complete this for me (not that i'd be adverse to it) but can anyone give me some guidance please? The question is linked: http://imgur.com/0cXlnkB 2AU(solid) + 3/2O2(gas) <--> Au203(solid) @25degrees. Gibbs free energy change =...
  7. T

    Find pressure in the problem below

    The question below is related to Gas Laws: Given length of cannon: 157.0 cm Diameter of cannon: 10.00 cm methanol (potential) combusted: 10.00 mL density of methanol: 0.7918 g/mL delta(H) methanol combustion: -715 KJ/mol density of air: 1.205 kg/meter(cubed) C of air: 1.006 KJ/Kg-K room...
  8. T

    Find pressure for the problem below

    The question below is related to Gas Laws: Given length of cannon: 157.0 cm Diameter of cannon: 10.00 cm methanol (potential) combusted: 10.00 mL density of methanol: 0.7918 g/mL delta(H) methanol combustion: -715 KJ/mol density of air: 1.205 kg/meter(cubed) C of air: 1.006 KJ/Kg-K room...
  9. J

    Atmospheric Pressure

    Hello, In regards to this question: Calculate the volume occupied by 0.01 moles of hydrogen gas at 20 degrees and atmospheric pressure. I'm wondering what it means by atmospheric pressure? Do I just assume its one?
  10. K

    Partial Pressure Question

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  11. A

    Vapour pressure of pure element

    Hello everybody! I am a new member in this forum! Now i have a problem in my thesis about vapour pressure of pure arsenic.:confused: Do you know about vapour pressure of pure arsenic P0 at temperature 1686K or how to calculate it? because i want to calculate partial pressure so i need to have...
  12. D

    States of water and pressure

    Hi! So I'm pretty confused about the effects that pressure has on water. If I increase pressure, I increase the boiling point. Likewise, if I increase pressure I increase temperature. How's that? That's the way air-conditioning works, by increasing pressure on one side and decreasing pressure...
  13. G

    Pressure

    CH4 (g) + 2O2 (g) ---> CO2 (g) + 2H2O (g) If this reaction is performed in a closed container (i.e. constant volume), and at constant temperature which of the following statements is TRUE? a)The pressure is higher after the reaction is complete. b)The pressure is lower after the reaction is...
  14. S

    Equilibrium concentrations and total pressure question.

    I understand about 90% of how to do this question. The only problem I'm having is understanding how volume comes into the calculations. My solution manual has it where; 0.186mol / 2.16L to find the initial concentration for H3CON and then volume is not brought into calculations of finding x...
  15. P

    Gibbs dependence on pressure

    For the question attached, I know that for a solid Gibbs wont change much with pressure (as the volume of the solid isnt really affected by pressure) and for a gas the Gibbs will be large and negative on decreasing pressure (as V increases) but I wanted to try and show this using the equations...
  16. J

    Adjusting for partial pressure of water wapor when calculating moles of gas produced

    In my chem lab, we did an experiment with electrolysis reactions. In the lab, hydrogen gas was produced and collected in an inverted buret that was originally filled with a sulphuric acid solution. One of the questions in the lab booklet asks me to find the number of moles of hydrogen gas...
  17. S

    What formula for this Vapor Pressure problem?

    This question is giving me a headache. I am thinking that I have to begin by converting grams to mL but not really sure. Any insight appreciated!
  18. M

    Partial Pressure of Gases Question! URGENT PLEASE!?

    Hi! I am new to this forum so bear with me please :) I have this Inorganic A-Level Chemistry Question about Dalton's Law of Partial Pressure: A mixture of gases containing 70cm3 of propane, C3H8 and 50cm3 of propene, C3H6, were exploded with 3.0dm3 of air containing 21% oxygen, at a pressure...
  19. P

    Reaction Rate Laws vs. Pressure

    Hey guys, So, my Chemistry teacher gave us a test, and one of the questions sparked heated debate among every student in the class. The question asked "What is the affect on "k" when increasing pressure?" The equation we were dealing with was Rate = k [A] [B]. Now, I understand increasing...