Need Help Solving Chemical Equations

1. Formaldehydem HCHO, once used as a preservative in biology laboratiries, is prepared commercially by the reaction: 2 CH3OH + O2 = 2 HCHO + 2 H2O The percent yield is 84.9% in a manufacturing plant. How much formaldyhyde can be expected from processing 397kg CH3OH? 2. A solution containing 1.63g if barium chloride is added to a solution containing 2.40grams of sodium chromate. Find the number of grams of barium chromate that can precipitate. Also determine which reactant was in excess, as well as the number of grams over the amount required by the limiting reactant. 3. Calculate the mass of CaCO 3that will precipitate from the addition of excess sodium carbonate to a solution ... click for more

equilibrium constant

(a) From the attached data calculate the equilibrium constant Kc for each of the three trials ... Please see attachment for data and (b), (c) and (d)

Equilibrium; Ionization; Concentration

15. Into a 5.0 liter flask was placed 35.7 g of PCI5 . The flask and contents were heated to 250 0 C, and then held at temperature until the following equilibiurm was established: PcI5 (g)< > Pc13 (g) + Cl2 (g) It was then shown by analysis that 875 g of Cl2 was pesent in the equilibrium mixture. Calculate K~. (This will be a numerical calculation, not simply the equilibirum expression) (10 points) 1 6. Given that K1 for acetic acid is 1 .8 X 10-5, calculate the percent ionization of 0.5 M acetic acid. (5 points) 1 7. Calculate the concentration of Hydrogen ions in a solution that Is 0.1 M with respect to acetic acid and 0.2 M with respect to NaC2H3O2. Use the K1 for ace... click for more

equilibrium no longer exists - reaction of opening a soft drink bottle

14. In a normal bottle of Coca Cola before it is opened, the following equilibrium exists: H2C03 <=> H+ +HCO3-; Ka = 4.2 x 1 O-7 Once the bottle is opened, this equilibrium no longer exists. Explain what happens, and write a new eqilibrium expression showing what happens. I'll give you a hint; there is more than one equilibrium, and its what happens when a soft drink goes "flat". (10 points)

Explain the NMR spectrum of NaBH4

Please explain the splitting pattern observed in this NMR spectrum of NaBH4.