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1. An isotope of the element Thallium, TL-206 undergoes beta decay with a half-life of 3.1 minutes. Assume you begin with 80.00 grams of the thallium isotope, what mass of the isotope will be left after 9.3 minutes have elapsed?
Report your answer to 2 decimal places
2. Assume that the 17.0 volt energy source is in a circuit that has a resistance of 6.00 ohms, determine the power consumption in watts
why is the internal-standard method often used in plasma emission
The VOA (Voice of America) broadcasts at 18.3 MHz for the Greenville Relay Station. What is the frequency and wavelength of the electromagnetic radiation and what is the energy of the photons and the speed of the electromagnetic wave
An empty 2.00L vessel is filled with 32.6 g of CH4 and 29.5g of H2S and then allowed to reach equilibrium. At equilibrium [CS2] = 0.15 and [H2]= 0.60. Using this data determine the value for Kc.
A 12.00 g sample of manganese is heated and allowed to react completely with the oxygen in the air to form an oxide having a mass of 18.99 g. What are the moles for each component? Also, what is the whole number ratio of manganese to oxygen.
Initially a mixture contains 0.601 mol each of N2 and O2 in an 7.65-L vessel. Find the composition of the mixture when equilibrium is reached at 3900°C. For the reaction below, the Kc = 0.0123 at 3900°C. N2(g) + O2(g) 2 NO(g)
The buret is filled with the NaOH titrant and the initial volume reading is immediately recorded without waiting the recommended 10-15 seconds. However, in part b-1, the 10-15 second time lapse does occur before the reading is made.
For each of the following unbalanced equations calculate how many moles of the second reactant would be required to react completely with 0.413 mole of the first reactant. Al + H20SO4 ----> Al2(SO4)3 + 3H2
Explain what is meant by the term dynamic equilibrium - distinguish between heterogeneous and homogeneous equilibria.
How many mL of boiling water would it take to dissolve 23g of caffeine? If the solution was cooled to 25?C, how many grams of caffeine would recrystallize out
the average energy output of a barrel of oil is 5.90 times106nbspkjbarrel.calculate the number of barrels of oil needed
Given a 4.50 L container of helium at 298 K and 1.00 atm, and a 3.00 L container of argon at 298 K and 1.00 atm, write a brief statement to explain whether or not atoms of He and Ar in their respective containers have the same average speed.
What property of the atom did Moseley associate with the wavelength of X-rays emitted from an element in his experiments?
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