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Calculate the standard enthalpy of formation of solid diboron trioxide (B2O3) using the following thermochemical information:
B2O3(s) + 3 H2O(l) B2H6(g) + 3 O2(g) H = +2147.5 kJ
2 H2(g) + O2(g) 2 H2O(l) H = -571.7 kJ
2 B(s) + 3 H2(g) B2H6(g) H = +35.4 kJ
A radioactive element has a half-life of 2.2 hours. How many hours will it take for the number of atoms present to decay to one-sixteenth of the initial value? Show your calculations
a new hydrocarbon with molecular formula C20H14 is obtained in low yield. The 13C NMR of this new product shows three peaks in the 120-150 ppm range and one peak at 54 ppm.
A 0.264-gram sample of an amino acid was dissolved in 95.0mL of water and titrated with 0.105M NaOH. The first equivalence point was found at V(OH)=16.3mL.
The solubility of N2 in blood at 37°C and at a partial pressure of 0.80 atm is 5.6 10-4 mol/L. A deep-sea diver breathes compressed air with the partial pressure of N2 equal to 3.6 atm.
A reaction mixture initially contains 2.8 M H2O and 2.6 M SO2. Determine the equilibrium concentration of H2S if Kc for the reaction at this temperature is 1.3 × 10-6.
After 273 m3 of ethylene oxide at 748 kPa and 525 K is cooled to 293 K, it is allowed to expand to 1.10 × 103 m3. What is the new pressure?
Butadiene, C4H6 (used to make synthetic rubber and latex paints) changes into C8H12 with a rate law of rate = 0.014 L/(mol·s) [C4H6]2. What will be the concentration of C4H6 after 2.0 hours if the initial concentration is 0.025 M
Provide the reaction mechanism when p-acetaminobenzensulfonic chloride reacts with water
The activation energy for the formation of HCl from its elements: H2 (g) + Cl2 (g) → 2 HCl(g) is 155 kJ mol-1. How much faster will this reaction occur at 200°C versus at 100°C?
What is the pH of a solution made by titrating 30.0 mL of 0.10M acetic acid with 30.0 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.
An unknown compound contains only C, H, and O. Combustion of 3.60 g of this compound produced 8.18 g of CO2 and 3.35 g of H2O.
138g of K and 448g of I react completely to form KI. What mass of KI would have been produced if 138g of potassium and 41g of iodine has been used?
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