determining

  1. E

    Help determining state of products

    Hey all- I'm working on some problems about writing out and balancing chemical equations. I think I understand it pretty well except for determining the physical state of the products. Here's the specific problem I'm stuck on: solutions of barium chloride and potassium carbonate react to form a...
  2. 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...
  3. U

    Determining volatile acidity in wine via distillation

    Hello, I'm a winemaker, but not an enologist.. so my chemistry skills are a bit limited. I'm trying to assess the amount of volatile acidity (VA) in wine (volatile acids in wine include several but the major acid is acetic acid, therefore we assume volatile acidity ~= acetic acid concentration...
  4. C

    Determining a VOx/Al2O3 catalyst

    Would you be able to help? I am a chemical engineering student doing a project on the production of Maleic Anhydride from Furfural. For our reaction we have found papers stating the type of catalyst that would be most preferable. It is in the form of VOx/Al2O3, the paper states the best...
  5. R

    Determining Unknown Sample

    I am performing an experiment and I need to determine whether an unknown sample (Sample A) of a chemical matches another sample containing: - 0.51 g sucrose - 0.67 g sand - 0. 43 g sodium carbonate - 0.34 g rice grains What tests can I perform on the unknown sample to see if it matches the...
  6. J

    Organic/ Determining process

    I need help with determining the the correct process. This is not homework and is a study guide in preparation for the upcoming finals week. Thanks in advance for any and all help.
  7. M

    Determining amounts of reactants and products

    How many grams of oxygen are required to burn 8.8 g of C3H8 in the following equation: C3H8 + 5O2 --> 3CO2+ 4H2O The choices I have are a. 8 b. 12 c. 16 d. 32 e. 64 I think the answer is 32 but I'm unsure of how to get it. This is what I have so far. 8.8g C3H8 / 44g of C3H8 = .2mol of C3H8...
  8. R

    Need help determining compounds and if an equilibrium reaction?

    I've tried contacting my teacher but unfortunately this is an online course and he is not responding. What are the compounds and intermediates of 1 through 4 in the equation in this link? And Why is this NOT an equilibrium reaction? Assuming that I add exactly 5ml of (1) (d=1.05g ml), how many...
  9. R

    Need help determining compounds and intermediates of this equation

    It asks me to name the compounds and intermediates at (1) to (7). 1 is acetic acid and 2 is alcohol but not sure on the rest.
  10. M

    Determining a Chemical Formula for BaCL2

    A student performing an experiement finds that her crucible and cover weigh, 21.234 g. After she adds the unknown, the mass goes up 21.520g. When the sample is converted to a chloride and is dried, she finds that the mass of the crucible, cover, and chloride is 21.533g. She was told that her...
  11. C

    Determining Molecular Formula

    What is the molecular formula of the compound: 2,3-dimethyl-4-cyclopentyl-5-ethyldecane Can someone explain the process on how to get started?
  12. K

    Determining number of atoms?

    Had these 2 questions for chemistry homework and it is really frustrating me. Here is the information: The radius of an atom of gold (Au) is about 1.35 Angstroms, How many gold atoms would have to be lined up to span 9.0mm ? If the atom is assumed to be a sphere, what is the volume in cm^3 of a...
  13. B

    Determining identity of acid in an electrochemical cell

    Hi, so I'm having some trouble with this question: Based on the following electrochemical cell configuration, a measured cell potential of +0.149 V, and the use of the following list of acids and their respective dissociation constants; determine the identity of the unknown acid (HA). Ionic...
  14. D

    Issue Determining delta E using Bohr

    This is the question I'm having trouble this. My professor is claiming that the answer is #3, but I am NOT getting that. I am assuming the nucleus charge is 2 - which gives me answer #4. This is what I'm doing - delta E = -2.18E-18 (2^2) (1/9-1/4) = 1.21x10^-18 I even tried the nucleus...
  15. C

    Determining molecular formula of a hydrate?

    MgSO4*xH20 mass of hydrated comlex (g) - 6.32 mass of anhydrous complex (g) - 3.54 mass of water (g) - 2.78 Based on those results, determine the molecular formula of the hydrate. My peers and I have gotten different answers, and my teacher can't quite teach properly so I resort to teaching...
  16. M

    Quantum Theory: Determining the delta E and wavelength of an Electron Transition

    Hi, In my chemistry textbook, there is one example of a question where an electron jumps from one energy level to another, and they ask you to calculate the change in energy and the wavelength of the photon. The sample question explains that you use Bohr's equation first to find delta E (Delta...