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The radioactive decay of T1-206 toPb-206 has a half-life of4.20 minutes. Starting with 5.00 x1022 atoms of T1-206, calculate the number of atoms left after 42.0 minutes.
which of the following are found in cell membranes?
What is the concentration of the HNO3 solution? (b) How many moles of NaOH were in excess after the first addition?
Calculate the potential delivered by a voltaic cell using the following reaction if all dissolved species are 2.5 x 10 -2 M and the pressure of H2 is 1.0 bar.
Based on the sign of E°cell, classify these reactions as spontaneous or nonspontaneous as written. Assume standard conditions.
Assume that gasoline is burned with 99% efficiency in a car engine, with 1% remaining unburned in the exhaust gases as VOCs. If the engine exhausts 16 kg of gases (MW = 30) for each kg of gasoline (MW = 100), calculate the fraction of VOCs in the ..
A thief uses a bag of sand to replace a gold statue that sits on a weight sensitive, alarmed pedestal. The bag of sand and the statue have exactly the same volume, 1.70L. (assume that the mass of the bag is negligible.)
In this exercise it was also assumed that the calorimeter was a perfect insulator and that no heat was lost to the surroundings.
a weather balloon at earths surface has a volume of 3.9 l at 275 k and 775 mm hg. if the balloon is released volume
Describe the preparation of 200 mL of 1.00% (w/v) aqueous CuSO4, from a 0.218 M CuSO4 solution.
At a certain temperature, Kw = 1 x 10-13. This means that pH + pOH = 13 at this temperature. Given this, what is the pOH of 0.05 M Ba(OH)2 at this temperature
A 50.0-mL sample of 0.50 M HCl is titrated with 0.50 M NaOH. What is the pH of the solution after 28.0 mL of NaOH have been added to the acid
Temperature is increased from 0 degrees to 823 degrees celsius. They are asking for the work of expansion of the gas in joules
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