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When 2.45 g of an unknown weak acid HA with a molar mass of 85.0g /mol is dissolved in 250.0g of water, the freezing point of the resulting solution is -0.256 C.Find Ka of unknown weak acid.
The Cl^- concentration in the water analysis given has been questioned. What concentration of Cl^- (mg/L) would make the cations and anions balance?
2.0 moles of a gas was collected in the lab at a temperature of 1.1 degrees C and a pressure of 9.5 atm. What volume will the gas occupy under these conditions.
Compute the % sodium carbonate (MM = 105.99 g/mol) in this sample.
A sample of gas originally at 37.2oC and 1.25 atm pressure in a 3.4 L container is allowed to expand until the pressure is 0.73 atm and the temperature is 14.9oC.
Compute the cell potential(E) after the reaction has operated long enough for the [Al3+] to have changed by .60 mol/L. suppose T=25 C
Calculate the Root Mean Square Speed and its average kinetic energy per molecule of Nitrogen and water vapor
What is the molar concentration of sodium hydroxide solution if a titration involved 0.0058 mole NaOH and 31.87 ml of sodium hydroxide.
Calculate the equilibrium constant for each of the reactions at 25 ° C .O 2 (g)+2H 2 O(l)+2Cu(s)→4OH - (aq)+2Cu 2+ (aq) Express your answer using one significant figure.
How much ice (in grams) would have to melt to lower the temperature of 355 mL of water from 24 C to 6 C (Assume the density of water is 1.0g/ml.
Compute the number of moles - As we know many volatile substances are present in Earth's atmosphere in trace amounts.
Compute the volume of CO 2 and water vapour produced and the volume of oxygen remaining, when 20.0 dm 3 of propane reacts with 120.0 dm 3 of oxygen. All gas volumes are measured at the same temperature and pressure.
what is the molarity of an aqueous solution containing 360g of glucose in 2.0L of solution.
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