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Petroleum is a fossil fuel containing many different carbon componds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C is still there? (t1/2=5,370)
Given stock solutions of glucose (1M), asparagine (100 mM), and NaH2PO4 (50 mM), how much of each solution would you need to prepare 500 mL
A line in the Balmer series of hydrogen has a wavelength of 434 nm. From what state did the electron originate? Ni=? In what region of the electromagnetic spectrum is this line observed?
A sample of ideal gas at room temperature occupies a volume of 34.0 L at a pressure of 722 torr. If the pressure changes to 3610 torr, with no change in the temperature or moles of gas, what is the new volume, V2
calculate the pH of a buffer solution made by adding 10.0g of anhydrous sodium acetate (NaC2H3O2) to 100 ml of 0.100M acetic acid. sume there is no change in volume on adding the salt to the acid.
You have a 100.0- mL graduated cylinder containing 50.0 mL of water. you drop a 115-g piece of brass into the water. To what height does the water rise in the graduated cylinder.
What is the wavelength, in nanometers, of the light emitted when the electron in a hydrogen atom drops from the energy level n_i = 12 to n_f = 5
Calculate the volume the gas will occupy if the temperature is increased to 175 degree Celcious while the pressure is held constant.
what is the theoretical yield of nitrogen in grams from part (a)? c) if the actual yield of nitrogen in the reaction in part (a) is 30.3g calculate the percent yield.
One of the students in lab decided to use two fractionating columns (one on top of the other) instead of just one. How would this a) affect the separation between hexane and heptane?
A solution made by dissolving 1.20 g of the unknown compound in 25.0 g of benzene had a freezing point of 4.7 degrees Celsius
The small bubbles that form on the bottom of a water pot that isbeing heated (before boiling) are due to dissolved air coming outof solution.
calculated the concentration of B-Carotene in your 2.00mL sample to be 2.082x10-6 M, how many grams of B-Carotene are in your sample?
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