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A 224mL sample of an aqueous solution contains 2.80% MgCl2 by mass. Exactly one-half of the magnesium ions are Mg?28, a beta emitter with a half-life of 21 hours. What is the decay rate (in atoms/day) of Mg-28 in the solution after 4.00 days? (Assume density of 1.02 g/mL for the solution)
A mixture of N2 and O2 gases are in a 2.0L container at 23 degrees C and at a total pressure of 1.00 atm.
A sample of nitrogen gas occupies a volume of 3.87 liters at 52.8 oC and 2.11 atm. What will the new temperature (in °C) when the volume increases to 4.55 liters and the pressure remains constant?
A bomb calorimeter whose components have a heat capacity of 6.66 kJ/°C is filled with 913 g of water. (The amount of water is not constant from experiment to experiment.
what is the core electron configuration, valence electron configuration and its Lewis symbol.
Aqueous solutions of sodium thiosulfate, Na2SO3, are used as an antidote to some snakebites. How many moles of sodium ions are found in 10.0 mL of a 0.15 M solution of Na2S2O3?
what is the pressure exerted onto the closed end of an apparatus if the atmospheric pressure is 720 torr and the height of the water is 22.3 cm.
A certain solvent has a normal freezing point of 1.72 ° C, and a freezing point depression constant of 5.07 ° C/m. What is the molality of a solution in
A voltaic cell consists of a Hg/Hg2^2+ electrode(E degrees=0.85V) and a Sn/Sn^2+ electrode(E degrees=-0.14V). Calculate[Sn^2+]if [Hg2^2+]=0.36 M and Ecell=1.04V at 25 degrees C.
Calculate the mass of air in an air-filled tire. Part B: Calculate the mass of helium in a helium-filled tire. Part C: What is the mass difference between the two?
A compound of bromine and fluorine is used to make UF6, which is an important chemical in processing and reprocessing of nuclear fuel. The compound contains 58.37% by mass of bromine. Determine its empirical formula.
how many grams of sodium hydroxide reacts with a solution containing 73.00 g HCl?
Calculate standard Delta G for the following reaction at 25 C. You will have to look up the thermodynamic
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