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The freezing point of benzene is 5.5oC. What is the freezing point depression of a solution of 5.00 g naphthalene (C10H8) in 444 g benzene (Kf of benzene = 4.90oC/m)?
What is the maximum amount of each product that can be formed? How much of the other reagent is left over after the reaction is complete?
What is the concentration of solute particles (or ions) in mol/L present in 1 L of the following aqueous solutions? Assume all compounds listed are soluble.
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of argon?
A sample of gas is collected over water at a temperature of 35.0C when the barometric pressure reading is 707 torr. What is the partial pressure of the dry gas, given PH2O = 42.2 torr?
Determine how many 1.5 L balloons at 755 mm Hg can be inflated with the gas in the tank, assuming that the tank will also have to contain He at 755 mm Hg.The temperature 25 C in all the cases.
Ferrocene, a substance used as a gasoline additive but which is also being studied because it shows some anticancer properties, has the percent composition of 5.42%H,64.56% C and 34.02%Fe.
Silver nitrate and sodium phosphate are reacted in equal amounts of 200.0 grams each to produce Silver phosphate and sodium nitrate.
Paris is one of my favorite European cities. This question relates to a possible problem with Parisian drinking water. A number of older buildings in Paris uselead (Pb) piping for transporting drink
A gaseous reaction occurs at a constant pressure of 35.0 atm and releases 65.0 kJ of heat. Calculate the total internal energy change, Delta U, in kilojoules.
Calculate the mass of the third isotope of neon in (a) amus and (b) in relation to the mass of an atom of 12C (i.e. the mass of the neon isotope = (some factor)*(the mass of an atom of 12C)).
Calculate the pH of each of the following solutions. Calculate the pH after .020 mol NaOH is added to 1.00 L of each of the four solutions in question 1
Rubidium has two naturally occurring isotopes: with mass 84.9118 and a natural abundance of 72.17%, and with mass 86.9092 and a natural abundance of 27.83%. Calculate the atomic mass of rubidium.
Analysis of a sample of a covalent compound showed that it contained 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for this compound?
Calculate the equilibrium concentration, in mol-L, of the following gases in the container at 483 K a) H2 b) H2S. Calculate the value of the equilibrium constant, Kc, for the decomposition reaction at
An average cup of coffee contains about 125 mg of caffeine, CaHroNqOz. If a student drinks 5 cups of coffee before their 8 AM Chem lecture in a desperate attempt to try to stay awake:
Based upon the results of this experiment, indicate whether Br+, Br-, or Br· initiates the isomerization of dimethyl maletae to dimethyl fumarate.
Water Vapor and nitrogen dioxide gas, NO2, are combined to manufacture ammonia. A byproduct of this reaction is oxygen gas. Write the balanced chemical equation for this reaction.
What should be the instantaneous rate of the first order decomposition of 3% H2O2 (3g H2O2 per 100g solution)? Assume the solution has a density of 1.00g/mL and that k=3.66E-3 s-1.
Predict how the solubility of the ammonium chloride would be affected. Explain the basis for each of your predictions.
Isopropyl alcohol, C3H8O, is sold in drug stores as rubbing alcohol. Isopropyl alcohol is a water-soluble liquid with a density of 0.785 g/mL at 25 oC. Calculate the molarity of a solution of isopro
Predict how the enthalpy, entropy, free energy, and temperature change in the system during this process. Explain the basis for each of your predictions.
A zero-order reaction has a constant rate of 3.50×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 1.00×10-2 M, what was the initial concentration?
How many seconds are required to produce 4.94 mg of chromium metal from an acidic solution of potassium dichromate, using a current of 0.234 A?