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Consider a clean sheet of barium metal with threshold frequency 6.07 x 1014 Hz illuminated by a light source. If the kinetic energy of ejected electrons is 1.31 x 10-18J, what is the wavelength (in
4032 kJ of heat is released during the combustion of 88.0 grams of propane, C3H8 (44.0 g/mol). What would be the amount of heat released for the combustion of 0.500 moles of propane?
One liter of a buffer solution is prepared by dissolving 0.115 mol of NaNO2 and 0.070 mol of HCl in water. What is the pH of this solution? If the solution is diluted twofold with water, what is the
A compressed air tank carried by scuba divers has a volume of 7.0L and a pressure of 130 atm at 20C. What is the volume of air in the tank(in Liters) at STP?
A constant opposing pressure of 0.159 atm until it has a volume of 1.000 L at 200 K and the pressure equals the opposing pressure. What is the work for the system?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 80.6 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this
Draw a cartoon of how three water molecules might be arranged in space, given this electrostatic interaction.
A mixture of propane and butane is burned with pure oxygen. The combustion products contain 47.4 mole% H2O. What is the mole percent of propane in the fuel?
48.0g piece of metal is dropped into 50.0mL of water in a graduated cylinder. The water level rises to 62.4mL. What is the density of the metal?
A 1.000 g sample of a compound containing C, H and O is burned in excess oxygen, producing 1.783 g CO2 and 0.734 g H2O. Determine the empirical formula of the compound.
If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol?
Assuming the dimensions of a room are 18 ft 3 12 ft 3 8 ft, estimate the mass of carbon monoxide in the room that would register 100 ppm on a carbon monoxide .
Mesitylene is a liquid hydrocarbon. a given sample is burned completely and it produces 17.0 g of CO2 and 4.64 g of H2O. determine the empirical formula for the compound.
Provide a rational argument that explains why the yield would increase when the amount of only one of the reactants is increased.
solution of an unknown substance in water at 300 K gives rise to an osmotic pressure of 2.25atm . what is the molality of the solution?
Assuming that the total pressure of the gases is 1.68 atm and that their mole ratio is 94 : 4.0 : 1.5 : 0.50, calculate the partial pressure (in atmospheres) of each gas.
A student places 2.00 moles of He (g) and 4.00 moles of Ar (g) into a flask at 298 K and measures the pressure to be 3.00 atm. Determine the pressure due to He (g).
A mass of 3.02 g of AgNO3 was consumed in the precipitation process. What is the percentage by weight of NaCl in the original mixture?
Design an experiment that would allow you to determine the aspirin concentration in an unlabeled sample spectroscopically.
Magnesium occurs in seawater to the extent of 1.4 g magnesium per kilogram of seawater. What volume of seawater, in cubic metres (M3) would have to be processed to produce 1.00 x 105 tons of magnesi
A commercial source of aspirin often found in the South is BC Powder. This powder contains aspirin and caffeine. Describe the types of intermolecular forces expected in these two compounds.
You will need to prepare 250 mL of 1 M H2SO4 and distilled water. How many milliliters of 2 M H2SO4 will you need?
Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.33g/mL and is 38.9% sulfuric acid by mass.
Calculate the pressure of the gas inside the cylinder. Write answer in kilonewtons. Round your answer to 2 significant digits.
What is the pH of this buffer solution? What is the ratio of the molarities of benzoate ion to benzoic acid when the pH of the buffer is equal to 4.60?