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A 25.0-ml sample of potassium chloride solution was found to have a mass of 25.115 g. When the solution was heated to dryness, the mass of the solute residue was 0.252 g. Calculate the mass/mass percentage concentration and molar concentration.
Calculate the equilibrium concentrations if the initial concentrations are 2.31M N2 and 0.54M O2. (This N2/O2 concentration ratio is the ratio found in air.)
If 0.52 moles of terephthalic acid are reacted with 0.50 moles of ethylene glycol, what is the number average degree of polymerization at 90 and 100% reaction
What are the n and l quantum numbers of the electron removed when Bi is ionized to Bi+ and would you expect element 115 to have ionization energy greater than, equal to, or less than that of bismuth? Explain.
For many reactions near room temperature, the rate and the rate constant approximately double for a 10 °C rise in temperature. What is the value of activation energy in kJ/mol for such a reaction?
Write a mathematical equations that show how you will calculate the detected activity from the count rate due to background radiation and the sample of KCl
When a molecule forms a hydrogen-bonded dimer as shown in your lab manual on pg 162 or is an electrolyte, you need to account for Van't Hoff factors. For the dimer shown in manual
Calculate the entropy change that occurs when 3.5 moles of an ideal gas expands from 1.75 L at 20 degress Celsius to 8.46 L at .54 atm.
What is the pH of the buffer after the addition of 0.04 mol of NaOH? (assume no volume change) pH
Starting with 3.30 moles of HBr in a 12.0 L reaction vessel, calculate the concentration of H2, Br2, and HBr at equil.
Splitting patterns and integrations may be used more than once, or not at all, as needed. Likewise, some bins might remain blank. Note that peak heights are arbitrary and do not indicate proton integrations.
If the molar enthalpy of water is 6.009 kJ/mol, how much energy is needed for 4.5 moles of ice to melt at STP?
Calculate the work w when 5.3 litre of an ideal gas at an initial pressure of 9.3 atm is expanded or compressed isothermally to a final volume of 9.3 litres reversibly
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