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Ascorbic acid (Vitamin C, present in apples) is burned in the presence of excess oxygen, to yield 5.80 mg CO2 and 1.58 mg H2O. Knowing that ascorbic acid contains only C, H, and O, and the mass of the sample used in the combustion was 3.87 mg:
1) Determine the empirical formula of ascorbic acid.
The compound X2Y is only partially dissociated in water solution to form X and Y2- ions. A 0.0100 m solution is found to freeze at -0.040°C. Calculate the apparent percent dissociation of X2Y. Kf for water = 1.86°C/m.
Calculate the change in entropy (in J/K) when a 44.0 g of nitrogen gas is heated at a constant pressure of 1.50 atm from 19.3 ºC to 86.5 ºC.
Consider the titration of 30.0mL of 0.050M NH3 with 0.025M HCl. Calculate the pH after the following volumes of titrate have added.
suppose a saturated solution of Barium Flouride contains 1.47*10^-2 M F-. What is the Ksp of the BaF2?
Find the change in entropy (S) for the system, surroundings and universe for the conversion of 1 mol of ice at 0 degrees C and 1.00 atm to 1.0 mol of steam (vapor) at 100 degrees C and 0.50 bar
Calculate the heat of formation of Magnesium oxide (MgO). Data given are: Mg(s) +2HCl (aq) ......> MgCl2 (aq) + H2 (g) ?H = 462 kJ/mol MgO(s) + 2HCl (aq) .......> MgCl2 (aq) + H2O (l) ?H = -146.0kJ/mol H2 (g) + 1/2O2 (g) .........> MgO (aq) ?H = -..
Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H2C2O4 and H2O in the balanced reaction
A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 350 mL of a solution that has a concentration of Na^+ ions of 1.20M
Further recylcing reactions that would take the products back to some of the monomers. What reactions to use? What would you get as products
If you have 300.0 mL of water at 25.00 degrees C and add 130.00 mL of water at 95.00 degrees C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
What is the value of K for the reaction between hydrocyanic acid and ammonia, which is shown here
A 45 kg person drinks 530. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 15% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake?
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