Posted by **kenny** on Sunday, August 5, 2007 at 9:01pm.

i need help solving this. Can you guys show me how it's done.

Radium-226 decays by alpha emission to radon-222, a noble gas.What volume of pure Radon- 222 at 23oC and 785mmHg could be obtained from 543.0 mg of radium bromide,RaBr2 in a period of 20.2 years.The half-life of radium-226 is 1602 years.

k = 0.693/t

_{1/2}
plug in the half life of Ra-226 and calculate k. THEN, convert 543.0 mg RaBr2 to mg Ra. I will call that value No. Use No in the following formula to calculate N (t is the time of 20.2 years.)

ln(No/N) = kt

From N, which is mg Ra remaining, calculate how much has decayed, convert the amount decayed into mass of Rn-222 and use PV = nRT to calculate the volume Rn at the conditions specified. Check my thinking.

## Answer This Question

## Related Questions

- S103 - Which element results if 2 protons and 2 neutrons are ejected from a ...
- nuclear physics - An atom of Radium-228 transmutes to radon-222. Write the ...
- chemistry 1405 - how to write a nuclear equation for the nuclear decay of Ra-226...
- Chemistry - The half-life of radon-222 is 3.82 days. If a sample of gas contains...
- Chemistry - The radioisotope radon-222 has a half-life of 3.8 days. How much of ...
- Chemistry - The half life of radon 222 is 3.82 days. If the initial mass of a ...
- chemistry - Radon-222 undergoes alpha decay.what is the nuclear equation
- Chemistry - Recently, there has been much concern about pollution in the home ...
- Physical Science - 1. Which equation correctly shows beta decay? (A) 210/82 Pb...
- Science - Radium has a half-life of 1620 years and decays into radon, which has...

More Related Questions