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An aqueous solution containing 18.1 g of an unknown molecular (nonelectrolyte) compound in 102.0 g of water was found to have a freezing point of -1.8 degrees C. Calculate the molar mass of the unknown compound.
how many mols of H 2 can produce
Electrical energy can be used to separate water into oxygen gas and hydrogen gas. In one such experiment,
a 5.0 dm3 sample of oxygen at a pressur of 200 kpa and 2.0 dm3 sample of nitrogen at a pressure of 500 kpa are introduced into a 2.5 dm3 vessel. what is the total pressure in the vessel?
A 100.0 mL of acetic acid solution of unknown molarity is titrated with 0.15 M NaOH solution. The titration requires 43.25 mL of the base. Determine the molarity of the acid, CH3COOH.
Two of these students will report, within experimental error, the same increase in solution temperature for the neutralization. Which are the two students? Explain.
One pound of Sulfur combines with one pound of oxygen to produce a gas. What is the percent by weight composition of this gas?
It then gives off a photon having a wavelength of 4.10 × 102 nm. What is the final state of the hydrogen atom? Values for physical constants can be found here.
the density of iron is 7.874 g/cm^3 at 300K. If iron forms a body-centered cubic lattice, what is the radius of an iron atom?
Explain Gibbs-Duhem Equation, In a certain binary solution, the activity of component 1 is given by
Consider the following cell: Pt|H2(g, 0.670 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 1.15 V at 25 °C and the standard reduction potential of the Ag /Ag half-reaction couple is 0.80 V, calculate the hydrogen ion con..
The equilibrium constant for the reaction of bromine with chlorine to form bromine monochloride is 58.0 at a certain temperature.
A 0.456 gram sample of an unknown monoprotic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH.
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