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Calculate how long will it take for a sample of radionuclide with a half-life of 27.1 days decay to 1.0% of its original value.
Hemoglobin has a mass of about 67,000 g/mol. It is 0.3335% iron by mass. How many iron atoms are in a molecule of hemoglobin?
How many grams of propane must be burned to heat 180g of water from -15 degrees Celcius
Evaluate reversibility of a process where an ideal monoatomic gas is first slowly compressed 10-fold by a gradually increasing external pressure (gas remains in thermal equilibrium with the surroundings)
A 10 mL sample of a solution of Pb(ClO3)2 was diluted with water to 21 mL. A 10 mL sample of the dilute solution was found to contain 0.021 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
Calculate the mass percentage of cobalt in Co3(PO3)2.
What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 . 5SO3?
How much heat is absorbed when 28 grams of H2O is converted into steam at 100 degrees C?
At what temperature would the population of the first rotational level of HCl be 1/e times the population of the ground state? Rotational constant for HCl, B, is equal to 10.59 cm-1.
What is the most likely chemical explanation for the fact that butter is a solid at room temperature while olive oil is a liquid?
Recall from class that we estimated the pi bond in ethylene to be about 350 kJ/mol. Use the same approach to estimate the strenghth
The electrolysis of molten Al2O3 at 980 ºC is used to produce metallic aluminum. A current of 360 A is used in the electrolysis cell. What is the rate of formation of aluminum, in kilograms per hour?
what is the pressure in a gas containter that is connected to an open-end manometer if the pressure of the atmosphere is 722 torr and the level of mercury in the connected to the container is 8.60cm
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