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Copper has two isotopes: Cu-63 (abundance = 69.2%, mass = 62.930 amu) and Cu-65 (abundance = 30.8%, mass = 64.928 amu). Calculate the (average) atomic mass of copper.
when a metal was exposed to light at a frequency of 4.63*10^15 Hz, electrons were emitted with a kinetic energy of 3.10*10^-19 J.
Ten grams of hamburger were added to 90 mL of sterile buffer. This was mixed well in a blender. One-tenth of a mL of this slurry was added to 9.9 mL of sterile buffer.
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.
The volume of an average stomach is about 1.0L. Suppose that a particular condition of acid indigestion is equivalent to the presence of a 0.50% HCl (by mass) solution.
The recommended dose is 10 body weight. How many of this suspension should be given to an infant weighing 16
If delta H for the reaction is -851.5 kJ/mol at 25'C, calculate the standard free energy change, delta G for the reaction at 25'C. Calculate the temperature at which the reaction changes from spontaneous to non-spontaneous.
Explain why alcohols such as ethanol and propanol are soluble in water, butanol is moderately soluble and pentanol is slightly soluble
What is the most appropriate temperature for storing your protein between purification steps? a) Room temperature b) 4° C c) -20° C d) -80° C
A 5.0 dm3 sample of oxygen at a pressure of 200kPa and 2.0dm3 sample of nitrogen at a pressure of 500kPa are introduced into a 2.5dm3 vessel.
1) How many litres of hydrogen gas will be produced by the decomposition of 90 L of water? (Assume that temperature and pressure are constant) Show ALL work.
Which best describes a solid?
Calculate How many palladium atoms will have to be laid side by side to span a distance of 4.28 mm if The radius of a palladium atom is 137 pm.?
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