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For a solution of 0.10M H3PO4, calculate the concentration of all the ionic species in solution (i.e., H+, OH-, H2PO4-, HPO42-, PO43-)
Concentrated hydrochloric acid solution contains 37.2 m/m% HCl. What mass of HCl is contained in 35.5g of concentrated HCl
What is the concentration of CH3NH2 added to the solution?
The Ka values for nitrous acid HNO_2 and hypochlorous HClO) acid are 4.5 10^{-4} and 3.0 10^{-8}, respectively. Which one would be more suitable for use in a solution buffered at pH = 7.0?
Exactly 5.02 grams of an unknown gas was sealed in a 3.0 L flask at 37.0oC and a pressure of 1.25 atm. Which one of the following is most likely to be the unknown
1- calculate the radius of a marble of mass 75.673g and density 2.443g/cm3, volume of sphere V= (4/3)?r3)
If 0.214 mol of argon gas occupies a volume of 652 mL at a particular temperature and pressure, what volume would 0.375 mol of argon occupy under the same conditions?
Drinking water in the USA cannot exceed 0.5 ppm mercury. What mass of mercury is present in 1.3 L of water at this concentration. What is the molar concentration of mercury
calculate the freezing point of a nonionizing antifreeze solution containing 388 g ethylene glycol, C2H6O2 and 409 g of water.
Draw a reasonable Lewis structure for POCl3. Assign formal charges for the atoms in your Lewis structure. Draw a second legitimate resonance contributor for POCl3
At 50°C the vapor pressure of ethanol is 0.30 atm, acetic acid is 0.08 atm, water is 0.12 atm, and acetone is 0.84 atm. A) Arrange these substances in order of increasing rates of evaporation.
An unknown mass of each of the given substances as with The final temperature is recorded as indicated 1.Pyrex glass (tf=67.6 C), 2.Sand (tf=70.4 C), 3.ethanol (tf=45.9 C), initially at 19.0 degrees celsius, absorbs 1930 Joules of heat
Calculate the enthalpy change, H, for this reaction per mole of X. Ignore any heat transfer to or from the calorimeter.
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