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A 0.4000 g sample that contained 96.4% Na2SO4 (142.04 g/mol) required 41.25 mL of barium chloride solution to reach the endpoint in a precipitation titration. What is the molarity of the BaCl2 solution
a buffer is prepared by combining 10.0 g of NaH2PO4 with 150 mL of 0.20 M NaOH and diluting to 2.0 L. what is the pH of the buffer? (Ka (H2PO4-)= 6.2 x 10^-8)
Is heat absorbed or evolved in the course of this reaction? Calculate the amount of heat transferred when 45.0 g of CH3OH (g) is decomposed by this reaction at constant pressure.
How the two solutions are properly mixed together? What is the role of the meniscus in this process?
The molar heart of neutralization from hydrochloric acid and sodium hydroxide is -57.3 kJ/mol. Use this accepted value to predict the heat evolved during the neutralization of 655mL of 1.00 M hydrochloric acid by 1.00 M sodium hydroxide
What is the pressure of the gas in this mercury manometer if h = 73 mm and atmospheric pressure
The equilibrium constant willYet another reaction has an equilibrium constant at 25 . It is an exothermic reaction, giving off quite a bit of heat while the reaction proceeds. If the temperature is raised to 200 , what will happen to the equilibri..
A solution of 75.0 g of benzene (C6H6) and 75.0 g of toluene (C7H8) has a total vapor pressure of 80.9 mmHg at 303 K. Another solution of 100.0 g benzene and 50.0 g toluene has a total vapor pressure of 93.9 mmHg at this temperature.c
Which of the following solvents would be the best choice to extract a slightly-polar organic compound from an aqueous solution? Explain why each of other solvents is less desirable than the solvent you have chosen.
How much magnesium chloride would you have to purchase to make up 10.0 L of bath water saturated with magnesium chloride
Predict that it was dissolved in HCl then mixed into the diethyl ether because diethyl ether is a base and since the benzoate contains an amine group they would remain unreactive with one another.
Eugenol can also be isolated from cloves using extraction with CO2. discuss the advantages and disadvantages of distillation versus CO2 extraction.
At 8:00 a.m., a patient receives a 58-mg dose of I -131 to obtain an image of her thyroid. If the nuclide has a half-life of 8 days, what mass of the nuclide remains in the patient at 5:00 p.m.
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