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Radioactive nitrogen-13 has a half-life of 10 minutes. After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?
Suppose you add 4.25 g of naphthalene, C10H8, to 67.9 g of benzene, C6H6, and they form an ideal solution. The vapor pressure of pure benzene is 0.1252 atm at the temperature of the experiment.
A line in the emission spectrum of an atom occurs at a wavelength of 560 nm. What is the energy difference between the two energy levels involved in this emission.
Determine how many milligrams of H 2 O are present in sample If the freezing point of a 100.0g sample of 2-methyl-2-propanol =24.59C?
How many grams of Na3PO4 will be needed to produce 400ml of a solution that has a concentration of Na+ ions of 0.900 ?
How many moles of CO2 will be produced if 3.119 g of O2 are reacted completely?
Predict the order for increasing binding energies of the C(1s) electron for the following compounds giving your reasoning.
if 58.7L of H2 are collected over water at 20C and 758 torr, what is the mass percent yield? (vapor pressure of water at 20C is 17.5torr)
what tempreture must 0.040 moles of water vapor be heated in a 500ml flask before the pressure in the flask becomes 2 atm.
A solution has a volume of 2.0 L and contains 36.0 g of glucose (C6H12O6). If the molar mass of glucose is 180 g/mol, what is the molarity of the solution.
Suppose that a sample of gas occupies 192 mL of volume at 25C and a pressure of 206 torr. What would be the volume if the pressure were changed to 506 torr at 25C.
A 1.70-g sample of a large biomolecule was dissolved in 11.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule.
What mass of sucrose C 12 H 22 O 11 must be mixed with 543 grams of H 2 O to make a solution with an osmotic pressure =8.00 atm at the temperature of 12 degree celsius?
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