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The light-emitting decay of excited mercury atoms is first-order, with a rate constant of 1.65E6 1/s. A sample contains 5.2E-6 M of excited mercury atoms.
a) Find the time at which the concentration will be 4.5E-7 M.
b) Find the concentration after 2.5E-6 s.
How might temperature changes in the human body have an impact on human health? (Use an example to help illustrate your understanding). The human body goes through various temperature changes during a single day.
Calculate the temperature of the system once equilibrium has been reached. Assume that Cp,m for Au and H2O is constant at its value for 298K throughout the temperature range of interest.
sodium carbonate reacts with hydrochloric acid as shown below in an unbalanced chemical equation. what mass of co2 is
Gel filtration of the protein gave an estimated molecular weight of 85000 g/mol. How many His residues are in the protein
find the molecular formula for a compound with the empirical formula ch2o. the molar mass of the compound is 180.2 g/mol
How many mL of 0.525M calcium chloride are needed to obtain 5.00x10 22 chloride ions.
Calculate the amount of heat transferred when 2.5 g of Mg(s) reacts at constant pressure. Express your answer using two significant figures
a large flask with a volume of 936 ml is evacuated and found to have a mass of 134.66g. it is then filled to a pressure
determine the molarity of a solution of twenty grams of ammonium bromide nh4br in enough water to produce 132 ml of
Cyclohexane has a freezing point of 6.50 degrees C and a Kf of 20.0 degree C/m . What is the freezing point of a solution made by dissolving 0.463g of biphenyl (C12H10) in 25.0g of cyclohexane
What is the hydronium ion concentration in a solution resulting from mixing 173 mL of 0.100 M HCN and 73 mL of 0.100 M KOH at 25 degrees C? Ka for HCN=4.9x10^-10
a gas in a sealed container has a pressure of 125 kpa at a tempurature of 30.0 degrees celcius. if the pressure in the
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