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A volume of 18.0 L contains a mixture of 0.250 mols N2 , 0.250 mols O2 , and an unknown quantity of He. The temperature of the mixture is 0 degrees C , and the total pressure is 1.00 atm. How many grams of helium are present in the gas mixture?
These 3 solutions including 2.362 g of Rb2S, 1.635 g of NaClO 4 , and 0.796 g of CuCl 2 , respectively are combined together? now calculate what would be the mass of this precipitae?
A solution is prepared by adding 20.0 mL of 0.100 M KI to 20.0 mL of 0.100 M AgNO3. The potential of the solution is measured with a silver indicator electrode with respect to the saturated calomel electrode. Use activities in this problem.
Calculate the pH of the solution that results from each of the following mixtures. a)140.0 mL of 0.26M HF with 230.0mL of 0.32M NaF b)185 mL of 0.12M C2H5NH2 with 265mL of 0.20M C2H5NH3Cl
calculate the heat in joules released by the dissolving salt. Assume that the specific heat of the solution is the same as thar of pure water(4.184J/g- celcius) and that the calorimeter is perfect.
Determine the pH at the equivalence (stoichiometric) point in the titration of 22.0 mL of 0.938 M HNO2 by 0.590 M LiOH. The Ka of HNO2 is 4.3 x 10-4.
When performing extractions it is often better to do multiple extractions rather than one large volume extraction. suppose you have 100mg of a sample dissolved in 0.6ml of water.
What is their role in this reaction? In the case of this particular example that you watched, where would each of these ions have come from?
In acidic aqueous solution, water can be reduced to H2 gas, but the H+ ions can be reduced more easity. What is the voltage of the hydrogen ion reduction half-reaction, under standard conditions
Calculate the amount of acid that would be left in the water solution after four 20-mL extractions with ether. Do the same calculation, using one 80-mL extraction with ether, to determine which method is more efficient.
Calculate the pH and the concentrations of all species present in a 0.19-M solution. The acid dissociation constants are K1 = 5.9 10-2 and K2 = 6.4 10-5.
Calculate the osmotic pressure generated when 12.9 grams of testosterone are dissolved in 168 ml of a chloroform solution at 298 K. what is the molarity and osmotic pressure
Calculate the pH of a buffer solution prepared by dissolving 23.4 g benzoic acid (HC7H5O2) and 35.0 g sodium benzoate in 215.0 mL of solution.
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