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Use the following information to find ?H°f of gaseous HCl: N2(g) + 3H2(g) ? 2NH3(g) ?H°rxn = - 91.8 kJ N2(g) + 4H2(g) + Cl2(g) ? 2NH4Cl(s) ?H°rxn = - 628.8 kJ NH3(g) + HCl(g) ? NH4Cl(s) ?H°rxn = - 176.2 kJ
As a technician in a large pharmaceutical research firm, you need to produce 400 mL of 1.00 M potassium phosphate buffer solution of pH = 7.29. The pKa of H_2PO_4^- is 7.21.
Nitrogen dioxide and water react to produce nitric acid HNO3 and nitrogen monoxide. 3NO2(g) + H2O(l) --> @HNO3(aq) + NO(g)
The final temperature of the calorimeter is 150°F. What is the mass of titanium used? The specific heat capacity of water is 4.184 J g-1 °C-1.
A container has a mass of 78.91 grams when empty and 92.44 g when filled with water. The density of water is 1.000 g/cm3. Calculate the volume of the container. When filled with an unknown liquid, the container has a mass of 88.42 grams. Calculate..
If 482.4 mL of 16.5 M H2SO4 solution is diluted to 5.6 L, what is the new concentration of H+ in the diluted solution?
Draw the stereochemical (3-D) structures of these compounds and explain these observations.
The room temperature and pressure were 23.6 deg C and 763.4 mm Hg respectively. The residue had a mass of 3.1915 grams. What was the partial pressure of oxygen?
Calculate the new vapor pressure of iodine at the same temperature when 100 bar of He gas is added to the container in which the iodine is held.
The solute increases the volume of the solution, and an increase in volume requires an increase in the temperature to reach the boiling point (derived from PV = nRT).
Calculate the pH at the equivalence point if 25.00 mL of 0.010 M barbituric acid (HC4H3N2O3) is titrated with 0.20 M NaOH. (Ka barbituric acid = 1.0 x 10^-5).
A solution is prepared by mixing 70.0 mL of 0.010 M BaCl2 and 175 mL of 0.080 M K2SO4. What are the concentrations of barium and sulfate ions in this solution? Assume only SO42- ions (no HSO4? ) are present.
If you have 4.63 g of caffeine dissolved in 69.9 mL of water and the extraction coefficient between H2O and CH2Cl2 is 21.51. How many grams of caffeine will extract into the CH22Cl2 layer if you use 62.9 mL
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