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you weigh out 50mg of benzoic acid and dissolve it in 1ml of diethyl ether. this is then extracted with 1 ml of water. the ether is removed, dried with sodium sulfate and ether evaporated yielding 30 mg of benzoic acid. what is the kp value for the ether water system.
delta H=483.6 kJ/mol If 2.0 moles of H2O(g) are converted to H2(g) and O2(g) against a pressure 1.0 atm at 145 degrees C, what is the delta E for this reaction?
A 125g metal block at a temperature of 93.2 degrees Celsius was immersed in 100g of water at 18.3 degrees celsius. Given the specific heat of metal (s= 0.900j/g x degrees celsius)
Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution that is 0.47 M HF and 1.21 M KF.
1) What type of intermediate is formed in the polymerization of styrene with butllithium? a) radical b) carbanion
In order to obtain a stock solution of 1000 ug/ ml for each of clomipramine hydrochloride and imipramine hydrochloride , how many grames of each compound should be weighed
the Na formed during the breakdown of NaN3 reacts with Fe2O3. How many grams of Fe2O3 are needed to react with 35.3 g Na?
Propanoic acid has Ka of 1.4x10^-5. If we make a solution 0.100M propanoic acid, what concentration of sodium propanoate should be added to give a buffer with a pH of 5.0?
A titration of 200.0 mL of 1.00 M H2A was done with 1.10 M NaOH. For the diprotic acid H2A, Ka1 = 2.5 × 10-5, Ka2 = 3.1 × 10-9. Calculate the pH after 600.0 mL of 1.10 M NaOH have been added.
Treatment of the bicyclic chloride A with lithium in tetrahydrofuran (THF) gave the monocyclic product B, C9H9Li. In deuterated THF, B exhibited a single proton NMR signal at 6.72 ppm
When 2.45g of an unknown weak acid (HA) with a molar mass of 85.0g/mol is dissolved in 250.0g of water, the freezing point of the resulting solution is -0.258 degrees C.
Assuming that your salt was a hydrated form of a sulfate mso4 nh2o calculate n. What values are quoted in handbooks for common hydrates
In countries where potassium iodide is added to salt, iodine deficiency or goiter has been almost completely eliminated. The recommended daily allowance (RDA) for iodine is 150 pg/day.
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