find

  1. L

    Find here manufacturer and supplier best Graphite Powder.

    Jayesh is a manufacturer and supplier of Graphite Powder. A small amount of use of graphite is to improve farming yields and performance. employed in seed planting and products harvest home. realize here Graphite Powder (ग्रेफाइट पाउडर) makers, suppliers & exporters in India. Get contact...
  2. C

    Henderson Hasselbalch solubility equation to find s0

    Hi guys, Does anyone know what steps they are following to get a final answer of 1 x 10-6 for s0 ? Any help appreciated Thanks
  3. I

    Where to find a propane burner. Any good supplies websites?

    I need a counter-top propane stove with temp-control that can reach 621.F for melting lead. Can't find anything anywhere.
  4. J

    Cannot grasp how to find number of moles & mass of a solute

    I'm in week 2 of college chemistry and I am completely lost on how to work out one of my chapter problems. :confused: It's: Calculate the number of moles and the mass of the solute in each of the following solutions: (a) 325 mL of 8.23 × 10^−5 M KI, a source of iodine in the diet (b) 75.0 mL...
  5. J

    How to find pH of a diprotic acid titrated by a strong base

    Given 20.0 mL 0.25 M of H2CO3 (Ka1=6.4x10^-6 and Ka2= 6.9x10^-10) titrated by a 0.50 M solution of NaOH, Identify the following: a) Veq1 and Veq2 = 10 mL and 20 mL respectively b)The pH at the following points: 0ml of added titrant = 2.90 3ml= 4.82 1/2 Veq1 = 5.19 at Veq1 3 mL past Veq1...
  6. J

    How would you find the molarity to this problem.

    A) How many moles and numbers of ions of each type are present in the following aqueous solution? Give your answers for the numbers of ions in scientific notation. 379 mL of 0.192 M aluminum chloride mol aluminum × 10 ions of aluminum mol chloride ×...
  7. J

    How do you find the coefficient. Please Help!!!

    When the following combination reaction is completed and balanced, what is the coefficient for lithium? Li(s) + N2(g) ---> I know it is 6 but how do you get 6.
  8. S

    How can I find out the mass in this equation

    given the thermochemical equation: 2Cu2O(s) ------- 4Cu(s) + O2(g) delta H : +333.8 calculate the mass of copper produced when 1.47 x 10^4 is consumed in the reaction the answer is 11.2 kg BUT HOW ?:confused:
  9. 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...
  10. 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...
  11. F

    How to find the net ionic equation

    Molecular Equation: Pb(OH)2(s) + 2HCl(aq) -> PbCl2(s) + 2H2O(liquid) Total Ionic Equation: Pb(OH)2(s) + 2H(aq) + 2Cl(aq) -> PbCl2(s) + 2H2O(liquid) Net Ionic Equation: ??? Would the net ionic equation be the same as the total ionic equation in this case, since there appear to be no spectator...
  12. S

    Given mass and Atoms find Unknown element

    5.44 grams of an element contains 3.24x10^22 atoms which element is this? I know avogadros # is 6.022x10^23 Not really sure what to do, I have been in my university chemistry class for over a month now. This is not a test question or an assignment, just a practice sheet worth no marks.
  13. T

    How to find H in kJ in complete combustion of 1 mol of butane?

    Hi guys! Please help, my exam is coming up and I am so confused by this question. Question: Butane has H of -2871 kJ/mol when it undergoes complete combustion into carbon dioxide and liquid water. Given the following Hf values: *Carbon dioxide: -393.5kj/mol *Oxygen gas: 0 kj/mol *Liquid...
  14. J

    Using D2h character table to find Vibrational modes of CO2

    This is the worksheet I have to do...the only example we have done was one for H2O which was pretty simple. My confusion now is that we are using the irrep and character table for D2H which we have never done. The book is not very helpful as it uses different terminology than we used in class...
  15. P

    find the empirical formula help.

    Hi, First post here. I have a substance with Fe 3.524 grams, S 3.034 grams, and O 4.542 grams. It is telling me to find the empirical formula. First I change the grams into mols by dividing the grams by the atomic mass: Fe 56, S 32, O 16 Result: Fe 0.06310 mol, S 0.09464 mol, O 0.2839 mol...
  16. M

    Find the pH of rain given Liters and a kg

    I can't remember which of the two equations I an suppose to use to solve this problem so I'm going to post both. 2NO + O2 --> 2NO2 3NO2 + H2O --> 2HNO3 + NO 2SO2 + O2 --> 2SO3 SO3 + H2O --> H2SO4 If NO = 10 kg, what is the pH of rain at 10^6L? Revelant Equations: pH = - log([H+]) mol...
  17. B

    Please help me find the name/structure

    Hey I've been trying to find out what this... N-hexanoic-Tyr-Ile-(6) aminohexanoic amide (H-Ahx-Tyr-Ile-Ahx-NH2) could be... the best I can do is CH3(CH2)4-CO-Tyr-Ile-NH-CH2-(CH2)4-CO-NH2 Am I close? If I could draw or just name it that would be great... any and all help is appreciated, thanks!
  18. J

    How do I find the millimoles?

    In my lab I have to find the millimoles but I am not quite sure how so please help. Data: Mass of KIO3 in sample (g) = 0.088 Molarity of Na2S2O3. (M) = 0.224 Initial buret reading (mL) = 0.99 Final buret reading (mL) = 14.23 Calculations: mL of thiosulfate used (mL) = 13.24 millimoles of KIO3...
  19. M

    cant find the answer to this anywhere in the book

    In the reaction 2 MnO4 -(aq) + 10 Br-(aq) + 16 H+(aq) → 2 Mn2+ (aq) +5 Br2(aq) + 8 H2O(aq) the reducing agent is ________. Express your answer as a chemical formula.
  20. G

    Pls Halp. Find group 7A element given equation and masses.

    For my General College Chemistry class I have to figure this out: You have a 275 mg sample of a compound that contains aluminum and a group 7A element. This compound reacts w/ excess AgNO3 as follows (X=unknown element) AlX3+ 3AgNO3---->3AgX+ Al(NO3)3 The reaction forma 581 mg of AgX...