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(a) Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the following thermochemical information:
4 B(s) + 3 O2(g) -----> 2 B2O3(s) ?H°= -2509.1 kj
2 H2(g) + O2(g) -----> 2 H2O(l) ?H°= -571.7 kj
B2H6(g) + 3 O2(g) -----> B2O3(s) + 3 H2O (l) ?H°= -2147.5 kj
(b) What is the frequency of radiation whose wavelength is 5.0 X 10-5m? (b) What is the wavelength of radiations that has a frequency of 2.5 X 10 8 s-1?
A pentapeptide was found to contain the amino acids Phe, Gly, Met, Ala, and Ser. N-Terminal analysis yielded the PTH derivative of alanine. Partial hydrolysis of the pentapeptide yielded the dipeptides
What alkene (including cis and trans isomers) would be produced by the dehydration of the following alcohols? Where possible, predict the relative amounts of each product according to Zaitsev's rule.
The reaction between N2 and H2 to produce NH3 is an important industrial process. Using the information from your text and handouts (you may assume ideal gasses) calculate the equilibrium constant for this reaction at 400 ºC
How to prepare ml of 0.2ml of calcium chloride solution from calcium chloride anhydrous or from calcium chloride dihydrate?
The compounds listed above were heated in ethanol and sodium hydroxide for approximately 60 minutes. Then extracted with dichloromethane to get the final product.
a 1.00-l gas sample at 100. degrees celsius and 600. torr contains 50.0 helium and 50.0 xenon by mass. what are the
Methyl salicylate is an ester and can be prepared from salicylic acid and methyl alcohol by the same method
What volume of hydrogen gas is produced when 83.8 g of iron reacts completely according to the following reaction at 25oC and 1 atm.
Diphenylethyne can be prepared from meso-1,2-dibromo-1,2-diphenylethane, by double E2 elimination via the corresponding alkene. a) Which alkene is initially formed?
The rate law for the reaction 3A ? 2B is rate = k[A] with a rate constant of 0.0447 hr-1. What is the half- life of the reaction
A sample of gas is collected over water at 14 degrees Celsius. The pressure of the resultant mixture is 113.0 kPa. What is the pressure exerted by the hydrogen alone?
a chemist wishing to do an experiment requiring 47ca half-life 4.5 days needs 5.0 mg of the nuclide. what mass of
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