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Draw an approximante titration curve for the titration of 75 mL of 0.020 M NH3 (pKa of NH4=9.24) with 0.10 M HCl. Label the axes with numbers.
Calculate the change in pH when 5.00 mL of .100 M HCL is added to 100 mL of a buffer solution
A solution of 53.6 g of glycerin in 133.7g of ethanol has a vapor pressure of 113 torr at 313K. Calculate the vapor pressure of pure ethanol assuming that glycerin is a non-volatile, non electrolyte solute in ethanol.
Assuming that its molar heat of vaporization is constant at 28.4 kJ/mol, the boiling point of C2H5NH2 when the external pressure is 0.709 atm is K.
Draw the path taken by Ann as she walks her dog. Represent each segment of Anna's walk with a vector. The vectors should start and end at the centers of the red dots located on the image.
An impure sample of sodium carbonate, (Na2CO3) is allowed to react by dissolving it in an aqueous solution of 0.134 M HCl, according to the following reaction:
What is the energy uncertainty associated with a short pulse of laser light that lasts for only 4.8 femtoseconds (fs)? Suppose the low energy end of the pulse had a wavelength of 727 .
A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide, mica (which is quartz or SiO2), and iodine.
Calculate the change in total internal energy for a system that releases 2.26 x 10^4 kJ of heat that does 5.54 x 10^4 kJ of work
If the following elements were to form ions, they would attain the same number of electrons as which noble gas? Noble gases- He, Be, Ar
Determine the total number of atoms in this chemical formula and calculate the molar mass of the solute and how many moles of solute are in the solution?
The flask was then shaken until the solution was uniform. A 25.0-sample of this glucose solution was diluted to 0.500 . How many grams of glucose are in 100. of the final solution?
At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings?
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