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Problem- Calculate the range of molar mass values that could be calculated from an uncertainty of + or - 1 degree in the freezing point depression (i.e. If the freezing point depression was 1 degree larger or 1 degree smaller than measured, what would the calculated value of the molar mass be?)
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what is the concentration of sodium ions in the resulting solution?
In a first order decomposition in which the rate constant is 0.03 sec-1, how much of the compound (in mol/L) is left after 26 sec, if there was 2.00 mol/L at the start
how many NH4Cl moles and how many NaOH moles would you need? About how many more moles of NaOH could you add before the buffer breaks down?
If, at a given temperature, the equilibrium constant for the reaction H2(g) + Cl2(g) 2HCl(g) is Kp,?then the equilibrium constant for the reaction HCl(g) ½ H2(g) + ½ Cl2 (g) can be represented as
The addition of one crystal of NaClO3 to a solution of this salt causes more crystals to precipitate from solution. If there is no temperature change, the resulting solution is
The standard change in free energy at 122oC is -6.001 kJ for the reaction A(s) + 2 B(g) ? AB2(g) We prepare a mixture at 122oC in a sealed 3.020 L vessel to contain 0.0370 mol A, 0.509 atm B, and 0.344 atm AB2. What is the free energy change (kJ) ..
The change in enthalpy Delta H for a reaction is -39.6 kJ/mol. The equilibrium constant for the reaction is 4.4×103 at 298 K.What is the equilibrium constant for the reaction at 635 K?
what mass of calcium carbonate is required to react with 137.8 mL of a 0.6943 M sulfuric acid solution?
Use standard enthalpies of formation to determine Horxn for: 3NO2(g) + H2O(l) ? 2HNO3(aq) + NO(g) Enter in kJ. -133.5 Find the change in internal energy for this reaction.
A photoelectron spectroscopy experiment is conducted in which light with a wavelength of 58.4 nm is directed at a sample of rubidium, resulting in the ejection of the electron
How many grams of pyridine are there in 100 mL of an aqueous solution that has a pH of 9.00? The Kb for pyridine is 1.9x10^-9
Problem- Urea ((NH2)2CO) can be formed from ammonia and carbon dioxide as shown in the following reaction. The ?H° value for this synthesis is -134.0 kJ. Calculate the ?H°f for urea.
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