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19 May 2018

93. A 1.50-L gas sample at 745 mm Hg and 25.0°C contains 3.55% radon-220 by volume. Radon-220 is an alpha emitter with a half-life of 55.6 s. How many alpha particles are emitted by the gas sample in 5.00 minutes?

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Related questions

Express your answer as a nuclear equation.

Part A Write the balanced nuclear equation for the decay of Ra-226

Part B Write the balanced nuclear equation for the decay of Rn-222.

Part C If a room contains 23000 atoms of radon-222, how many atoms of radon-222 remain after 15.2 days?

Part D Suppose a room has a volume of 62000 L (6.2Ã104L). If the radon level is the maximum allowed (4 pCi/L), how many alpha particles are emitted from Rn-222 in 1 day? Assume that radon level is constant during this day.
(1 Ci = 3.7Ã1010 disintegrations/s)

Please help I have no idea how to do these

82. Polonium-218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains 55 mg of Po-218 (atomic mass- 218.008965 amu), how many alpha emissions occur in 25.0 minutes? If the polonium is ingested by a person, to what amount of radiation in Ci) is the person exposed?

A sample of an alpha emitter having an activity of 0.18 Ci is stored in a 25.0-mL sealed container at 22 °C for 245 days. (a) How many alpha particles are formed during this time? (b) Assuming that each alpha particle is converted to a helium atom, what is the partial pressure of helium gas in the container after this 245-day period?