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what concentration of aqueous NaCl solution freezes at -15.2 C? the freezing point of pure water is 0.0 C and Kf of pure water is -1.86 C/m.
Find the enthalpy change for the chemical reaction below PCl5(g) ----> PCl3 (g) +Cl2 From the following equations:
In the reaction MnO4- + 8H+ + 5e- ⇔ Mn2+ + 4H20, the manganese in 3.95 grams of KMnO4 is reduced to Mn2+. How many coulombs of charge must have been transferred to the permanganate ion.
What is the Ka of HCOOH? What is the base on the left side of the equilibrium? What is the conjugate base on the right side of the equilibrium?
Calculate the heat absorbed by 15.0 g of water to raise its temperature from 20.0oC to 50.0oC at constant pressure. The specific heat of water is 4.18 J/g.oC
What mass of hydrogen can be produced from 2.90 g of aluminum and 14.0 g of HCl in the above unbalanced reaction?
how many grams of HNO3 must be dissolved to make 25L of a solution that has a pH of 1.5
Work out the solubility of copper(II)sulfide. Take it that 1 litre of the mixture weighs 1 kg. (in g/100g), CuS (s) Cu^2+ (aq) + S^2- (aq)
What is the PH of a 0.085M solution of ammoniun chloride. Kb for ammonia is 1.8 times, Calculate the pH fo a solution made by mixing 125ml of .200M HCl and 500 ml fo 0.0500M KOH
4.00g of H2SO4 solution was diluted with H2O and added with excess of cacl2, and The washed and dried precipitate of BaSO4 weighted 4.08g. Calculate percent H2SO4 in the original acid solution.
A 52.2 g block of an unknown metal at 85.5oC was dropped into an insulated vessel containing approximately 37 g of ice and 27 g of water at 0oC. After the system had reached equilibrium
A buffer solution containing 0.25 M Acetic acid and 0.56 m Sodium acetate. After addition of 0.0060 mol HCL what is Ph of buffer.
Distinguishing between Organic Molecules, What chemical tests might be used to distinguish between: pentanal and 2-pentanone, between benzyl alcohol and diphenylmethanol?
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