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The volume of a piece of topaz (a semiprecious gem) weighing 5.95 g is 1.7 mL. The densities of chloroform, carbon tetrachloride, and dibromomethane are 1.48, 1.59, and 2.50 g/cm3 respectively. On which liquid(s) will topaz float?
Given the heat of combustion for the following reactions, determine the enthalpy of formation for pentane, C5H12.
In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. The solution was heated by burning natural gas in a Bunsen burner to distill the ethanol that formed in the flask.
Question- To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 4.20 nm in diameter
When pentane C5H12 burns in oxygen, it produces carbon dioxide and water. If 85.5 g of pentane is burned, what voulume of carbon dioxide is produced at STP (The density of CO2 is 1.997 g/L.)
Use the bohr model to calculate the wavelength of the light emitted when the electron in a hydrogen atom falls from the = 5 shell to the = 3 shell
Problem- You have a 12 volt lead storage battery in your car (you can find the equations for the redox reactions in your text book). If you run two 45 watt headlights for 2.0 hours using your battery as the energy source, how many grams of lead su..
what products would expect to obtain in the reaction of alpha-naphthaldehyde with KOH? write a detailed reaction mechanism.
The combustion of gasoline produces carbon dioxide and water. Assume gasoline to be pure octane and calculate the mass (in ) of carbon dioxide that is added to the atmosphere per 1.7 of octane burned
What molar ratio of sodium acetate to acetic acid should be used to prepare a buffer with pH = 4.5? Ka acetic acid = 1.8 x 10-5.
what mass in grams of a 0.5 m solution of sodium acetate in water would you use to obtain 0.150 mol of sodium acetate
The mass spectrum of 1-ethyl-1-methylcyclohexane shows many fragments, with two in very large abundance. One appears at m/z = 111 and the other appears at m/z = 97.
Problem- What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the overall redox equation: Cr2O72-(aq) + 6Fe2+(aq) + 14H+(aq) ? 2Cr3+(aq) + 6Fe3+(aq) + 7H2O(l)
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