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An analyst is directed to prepare accurately to four significant figures 100mL of a solution of Na2CO3 that is around 0.25 M. The laboratory supervisor provides a solution of 4.021M Na2CO3, and some pure, solid Na2CO3, and tells the analyst to proceed by whichever method is easier. Give specific outline as to how you would prepare the solution by two different methods, one by dilution and one by weighing pure chemical. (Show calculation, what type of glassware is used, include size and kinds of pipets and flasks)
A second-order reaction required 53.8s for the concentration to drop from 0.50 M to 0.36 M. What is the value of the rate constant
For a reaction where the general form of the rate law is = [A]m[B]n, the subsequent data were collected. Explain what is the order of the reaction with respect to A. Explain what is the order of the reaction with respect to B
Problem- What mass of potassium hydrogen sulfate is required to make 300. mL of a solution with a pH of 2.76. (The Ka of HSO4 Ka = 0.012.)
the solubility of oxygen gas in water at 25degc and 1.0 atm pressure is 0.041 gl. what is the solubility of oxygen in
What is the pH of a buffer that results when .50 mole of H3PO4 is mixed with .25 mole of NaOH and diluted with water to 1.00 L The acid disassociation constants of phosphoric acid
After the second dilution 100.00ml of that solution where transferred to a 150.0 mL flask and it was diluted to the mark. What is the concentration of the final solution
State whether the following reactions are spontaneous or non spontaneous at low temperature, high temperature or all temperatures
A catalyst lowers the activation energy of a reaction from 215 kJ to 206 kJ. By what factor would you expect the reaction-rate constant to increase at 25*C? Assume that the frequency factors
determine how many mg of a 298 mg sample remains unreacted after twenty three days if 32p decompose by a first-order
Express the pressure values numerically in atmospheres, separated by commas. Enter the partial pressure of methane first, then ethane, then propane.
If the heat of combustion for a specific compound is -1040.0 kJ/mol as well as its molar mass is 78.87 g/mol, explain how many grams of this compound must you burn to release 333.90 kJ of heat
Problem- An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gases called air. If the flask volume is 3.50 L, and the air is at standard temperature and pressure, how many gaseous molecules d..
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