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Hydrogenation of carbon double bonds C=C (i.e. adding a hydrogen on each carbon atom and thus reducing the double bond into a single bond: H-C-C-H) is a very common process in organic and polymer chemistry. Using the data from the following table, calculate the ?Hreaction when ethylene C2H4 is reduced into ethane according to the reaction below: C2H4(g) + H2(g) --> C2H6(g) Bond Bond enthalpy (kJ/mol) C=C 620 C-C 347 H-H 436 C-H 414 The ?Hreaction is 1.----- kJ/mol
The rate constants of some reactions double with every 10 degree rise in temperature. Assume that a reaction takes place at 350 K and 360 K. What must the activation energy be for the rate constant to double as described
How many grams of sodium formate, NaCHO2, must be added to 750.0mL of .250 M of formic acid, HCHO2, to obtain a buffer with pH of 5.5
slower than Friedel-Crafts alkylation of benzene and gives a mixture containing mostly o- and p-tert-butyltoluene. d. slower than Friedel-Crafts alkylation of benzene and gives mostly m-tert-butyltoluene.
Cannot be determined from the information provided. 9. Starting with the initial concentrations provided in the question above, what will be the equilibrium concentration of CO2? a) 1.6 M b) 1.8 M c) 2.0 M d) 2.2 M 10. What is KC for this process ..
The total volume of seawater is 1.5X10^21 L. Assume that seawater contains 3.1 percent sodium chloride by mass that its density 1s 1.03 g/mL. Calculate the total mass of sodium chloride.
a gas cylinder contains 40.0 L of gas at 45.0C and has a pressure of 650. torr. What will the pressure be if the temperature is changed to 100C?
As a result, the pressure inside the vessel drops to 30.64 atm at 25 C. Calculate the final percent by mass of ozone in the vessel.
A compound is found to contain 10.37 % phosphorus, 4.689 % nitrogen, and 84.95 % iodine by weight. What is the empirical formula for this compound
If aluminum is diffused into a thick slice of silicon with no previous aluminum in it at a temperature of 1100?C for 8 hours, what is the depth below the surface at which the concentration is 1016 atoms/cm3
Suppose you wished to control the PO43- concentration in a solution of phosphoric acid by controlling the pH of the solution. If you assume you know the H3PO4 concentration, what combined equation would be useful for that purpose? Include physical..
devise a general method for determining the fractional abundances of two or more isotopes from a mass spectrum. your method must include some means of measuring the signals
Calculate the molarity of a solution of 25.2mL of methanol combined with enough water to make 622mL of solution (density of methanol is 0.79180g/mL).
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