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A compound containing only C, H, and O, was extracted from the bark of a sassafras tree. The combustion of 91.3 mg produced 248 mg of CO2 and 50.8 mg of H20. The molar mass of the compound was 162 g
A test tube standing vertically in a test tube rack contains 2.2 cm of oil, What is the gauge pressure on the bottom of the tube
You throw a 13 g rock and it leaves your hand at a speed of 17 m/s. What is the de Broglie wavelength of this rock
A low-power laser used in a physics lab might have a power of 0.55 mW and a beam diameter of 2.6 mm. Calculate the average light intensity of the laser beam
A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor, How tall is the tower
If the shortest-wavelength bremsstrahlung X-rays emitted from this tube is 23.40 pm, what is the voltage across the X-ray tube
A hydrogen atom is in the 2s state. Determine the principal quantum number and the energy of the state
The mixture is cooled to the temperature of liquid nitrogen at which ammonia freezes out and the remaining gas is removed from the vessel. Upon warming the vessel to 0.00 degrees C and 1 atm , the v
Balance the following net ionic equation. Use H+ rather than H3O+. What is the sum of the coefficients? (Do not forget coefficients of one.) I- + NO2- ® NO + I2 (acidic solution)
An electron remains in an excited state of an atom for typically 10-8 s. What is the minimum uncertainty in the energy of the state
Calculate the percentage composition by mass of each of the elements in sulfuric acid. Report each of your answers to 4 significant figures
Give five very important precautions to be taken into consideration while preparing an alcohol using Grignard reaction, explain each one
Consider an airless, non-rotating planet of mass M and radius R. Calculate the ratio h/R of the projectile's maximum height to the planet's radius
A frog with the a mass of 4.60 oz can catch 2.0 flies every 3.5secs. if the avg. fly has a mass of 2.5mg how long will it take the frog to increase its mass to .35kg
How many milliliters of a 0.150 M magnesium hydroxide solution are needed to neutralize 1.282 L of a hydrochloric acid solution that is 0.1048 M
If there is a section of the hose where the diameter decreases to 1.93 cm, what is the speed of the water in this section
1.75 pounds of pasta dough with a density of about .84g/cm^3 how many feet of 2" wide, 1/32" thick lasagna noodles can be made
An undersea research chamber is spherical with an external diameter of 5.20 m. The mass of the chamber, when occupied, is 66400 kg. find the buoyant force on the chamber
Calculate q, and determine whether heat is absorbed or released when a system does work on the surroundings equal to 64 J and ?U = ?213 J.
A certain raft is 2.5 m long, 0.55 m wide, and 14 cm deep. If the raft itself has a mass of 15.6 kg, what is the maximum mass it can support in fresh water
One arm of a U-shaped tube (open at both ends) contains water, and the other alcohol. at what height will the water be
A hydraulic lift is used to jack a 970 kg car 13 cm off the floor. The diameter of the output piston is 18 cm, and the input force is 250 N. Calculate the combined work input of all of the strokes
What is the osmotic pressure developed at 17 oC by an aqueous solution that is 0.111 M in AlCl3
When a wilf fire approaches a residentail area, a house owner climbs up to the roof, what is the minimum water pressure of the source(faucet) end of the hose
Calculate the heat energy released when 10.9 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.