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Principles of Modern Chemistry, 7th ed. Suppose an atom in an excited state can return to the ground state in two steps. It first falls to an intermediate state, emitting radiation of wavelength
What mass of sodium cyanide must be added to 250ml of water in order to obtain a solution having a pH of 10.50? Ka(HCN) = 4.9 x 10 ^-10
Calculate the solubility (in M units) of ammonia gas in water at 298K and a partial pressure of 6.50bar . The Henry's law constant for ammonia gas at 298K is 58.0 M/atm
The average human is 62 kg. There are about 6 billion people on the planet. In one week period explain what is the total increase in entropy of the universe coming from us humans. Explain the average temperature on earth is 293 K.
4-5: Freezing Point Depression If you dissolve a substance such as ordinary table salt (NaCl) in water, the freezing point of the water will decrease relative to the freezing point of the pure water. This property is used to melt the snow or ice on r..
calculate the freezing point and boiling point of the following aqueous solutions assuming complete dissociation.a.
In some cases a Br-Br bond can be broken by the absorption of photons of light energy. Br-Br bond energy is 192 kj/mol determine the photon energy and the wavelength (in nanometers) associated with breaking this bond.
Protein Quantification :why did you choose one standard curve over the other for analysis of your unknown?
The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 355g of pure Cu
hydrogen sulfide is composed of two elements hydrogen and sulfur. in an experiment 6.100g of hydrogen sulfide is fully
You have to prepare a pH 5.06 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN. Which solutions would you use
you have a 30.0 L cylinder of helium at a pressure of 132 atm and a temperature of 24 degrees Celsius. the He is used to fill balloons to a volume of 3.00 L at 1.07 atm and 29 degrees Celsius.
how do you calculate the density of metals? could this method be used for determining the density of mercury as well?
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