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What is the mass percent composition of oxygen in a compound having the empirical formula C20H40O1?
Calculate the pH during the titration of 32 mL of 1.149 x 10-1 M NaOH with 1.161 x 10-1 M HBr solution after the following additions of acid.
Sketch a series of titration curves for the titration of a strong acid with a strong base where the concentration of the acid is 10-1, 10-2, and 10-3 mol dm-3 respectively. Explain why the choice of indicators is restricted at different acid conce..
Which of the following involve an increase in the entropy of the system?
Given that Ea for a certain biological reaction is 48kJ/mol and that the rate constant is 2.5 x 10^-2 s-1 at 15 degrees celsius
Find the pH and percent dissociation of a 0.100 M solution of a weak monoprotic acid having the following Ka value. Ka = 1.0 x 10^-5
an optically pure compound was diluted to 400.0 mL with water and placed in a polarimeter tube 15.0 cm long. The measured rotation was -2.87° at 25 °C. Calculate the specific rotation of the compound.
When a 1.30-g sample of ethanol (alcohol) is burned in a calorimeter, the heat released increases the temperature of 870g of water in the calorimeter from 18.5 C to 28.9 C .
how does a water softener work chemically? What's better to drink tap water or bottle springwater and why?
A buffer contains 0.30 M acetic acid and 0.20 M sodium acetate. What is the pH of the buffer as prepared and after 0.030 mol/L of a strong acid or 0.030 mol/L of a strong base are added (Ka = 1.8 x 10-5).
The student is supposed to observe the bacterium and make a drawing. However, the student, having just learned about the Heisenberg uncertainty principle in physics class, complains that she cannot make the drawing.
Take N3 as the independent variable and solve for N2 in terms of N3. Then solve for N1 in terms of N2 and N3. b. Taking note that there cannot be a negative population, what are the possible values of N3 ?
determine the freezing point depression, delta Tf, for the ionic solution. b. determine m effective for ionic solution. c. determine the van't Hoff factor, i, for the ionic compound.
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