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Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 580 nm. How much energy is emitted by an excited sodium atom when it generates a photon? Answer in units of J.
A 1.80-g sample of a large biomolecule was dissolved in 21.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecu
Calculate the weight of potassium chlorate required to prepare 380mL of wet oxygen collected over water at 20degrees celsius and 750mm of Hg.
At 760 K, 15% of a sample of cyclopropane changes to propene in 6.8 min. What is the half-life of cyclopropane at 760 K?
A metal object with a mass of 19g is heated to 96 degree celcious, then transferred to acalorimeter containing 75g of water at 18 degree celcious. Tjhe water and objectmreach a final temperature at
Use standard reduction potentials (shown below) to calculate the potential of a nickel-cadmium cell that uses a basic electrolyte that has a 0.6 M hydroxide concentration.
A 255-mL flask contains pure helium at a pressure of 745 torr. A second flask with a volume of 455 mL contains pure argon at a pressure of 725 torr. If the two flasks are connected through a stopcoc
how high (in meters) can the person climb based on this energy intake? [Hint: The work done in ascending is given by mgh, where m is the mass (in kilograms), g the gravitational acceleration (9.8 m/
How many mL of 0.385 M perchloric acid would have to be added to 150 mL of this solution in order to prepare a buffer with a pH of 10.800.
A 5.0g sample of a hydrate of CaCl2 was heated, and only 4.3 g of the anhydrous salt remained. what is the percentage of the water was in the hydrate?
How many grams of ammonium sulfate can be produced in 30 mol of H2SO4 react with excess NH3 according to the equation 2NH3(aq)+H2SO4(aq)-->(NH4)2SO4(aq)?a
what is the volume of dry gas at standard conditions? The vapor pressure of water is 92.5mm Hg at 50.0 degrees celsuis.
Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant
A 14.0 g sample of CaCl2 is dissolved in 121 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming th
What volume of 0.131 M BaCl2 is required to react completely with 42.0 mL of 0.453 M Na2SO4? The net ionic equation for the reaction is Ba2+(aq) + SO42-(aq) --> BaSO4(s)
An experiment shows that a 247mL gas sample has a mass of 0.432 gas at a pressure of 752 mmHg and a temperature of 28C. What is the molar mass of the gas?
A compound contains only carbon, hydrogen, and oxygen. Combustion of 0.01068 g of the compound yields 0.01601 g of CO2 and 0.00437 g of H2O. The molar mass of the compound is 176.1 g. What are the e
An unknown sample of Cu2+ gave an absorbance of 0.262 in AA analysis. Then 1.00 ml of solution containing 100.0 ppm Cu2+ ws mixed with 95.0 ml of unknown and diluted to 100 ml in a volumetric flask,
Calculate the pressure (in atm) exerted by 1.00 mole of acetylene at 125°C in a 20.0-liter container. The van der Waals constants for acetylene are: a = 20.0 L2 • atm/mol2, b = 0.100 L/mol
If a student determined that the circumference of a balloon filled by the boiling point of liquid nitrogen was 45 cm, what volume of nitrogen gas has been generated?
What is the insataneous rate at t=800s? What is the insataneous rate at t=800s?
If a mixture of solid palladium(II) oxide and 0.10M carbon monoxide is allowed to come to equilibrium at 1000K, what will be the equlibrium concentration of CO2.
Given that the rate constant for the decomposition of rm X is 1.60 {M}^{-1}cdotrm min^{-1}, calculate the concentration of rm X after 11.0 min.
n photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen. If 4.50 moles of water react with carbon dioxide, what mass of gl
What is the class and subclass of Fe(s) + CuSO4 → FeSO4(aq) + Cu(s) ? I believe it is double replacement, but would it be precipitate or acid-base?