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An aqueous solution of CaCl2 has a vapor pressure of 83.0mmHg at 50 C . The vapor pressure of pure water at this temperature is 92.6mmHg . What is the concentration of CaCl2 in mass percent?
Explain the relationship between the electron configuration and the corresponding principal and angular momentum quantum numbers for each of your elements.
A solution contains 0.50 M Cl^- and 0.50 M Br^- ions. Solid AgNO3 is added without changing the volume of the solution. What is the Br^- concentration when AgCl(s) first begins to precipitate?(Ksp for AgCl = 1.8 x 10^-10 and Ksp for AgBr = 5.1 x 1..
An oxygen tank contains oxygen at a pressure of 70 kPa. When the pressure drops to 36 kPa, the temperature increases from 300 K to 350 K. If the initial volume is 9 L, what is the final volume?
According to the following reaction, how many moles of potassium sulfate will be formed upon the complete reaction of 0.462 moles potassium hydrogen sulfate with excess potassium hydroxide
On a climb up mt. Whitney, the atmospheric pressure drops to 467 mmHg. What is the pressure in terms of the following units? a) atm; b) torr; c) in. Hg; d) Pa.
what is the chemical calculation to figure out the following: calculate the new molarity if the following dilution is made (assuming the volumes are additive): 25.0 mL of water is added to 10.0 mL of 0.251 M CaCl2 solution.
25.0 cm3 of a saturated solution of Ca(OH)2 required 21.0 cm3 of 0.0500 mol dm-3 HCl for complete neutralisation. Calculate the [OH-(aq)] and the [Ca2+(aq)] in the saturated solution.
Which of the following are a conjugate acid-base pair in the above reaction?
In a certain process, 750. J of work is done on a system which gives off 195 J of heat. Calculate the total energy change (?U) for this process
What substance (element on the periodic table) resides at the heart of the structure of vitamin B12? 2 points
1g soil has been spiked with 0.1ml of 100 ppm (v/v) trimethylbenzene and subsequently extracted with 250 mL pentane. The extract is then measured with GC-FID.
Classify the substances according to the strongest solute-solvent interaction that will occur between the given substances and water during dissolution
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