There are two stable isotopes of iridium, $\ce{^191Ir}$ and $\ce{^193Ir}$. If you randomly pick an iridium atom from a large collection of iridium atoms, which isotope are you more likely to select?
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$\begingroup$ It depends on which isotope is more abundant. There should be tabulated values of these; a quick internet search will throw them up. $\endgroup$– user7232Commented Sep 17, 2014 at 11:57
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$\begingroup$ even in the exams right ? $\endgroup$– shaimaCommented Sep 17, 2014 at 12:13
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$\begingroup$ Clearly not, but you'd expect such information to be given to you. $\endgroup$– user7232Commented Sep 17, 2014 at 12:38
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1 Answer
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An urn contains nothing but
- 63 white balls and
- 37 black balls.
You grab into the urn, pick one item, look at it and put it back.
What is the probability that you drew:
- a ball
- a white ball
- a black ball
- a red ball?
answered Sep 17, 2014 at 11:16
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$\begingroup$ @shaima Exactly :) Amazingly, 63% and 37% are roughly the abundancies of the two natural iridium isotopes: $\ce{^{193}Ir}$ and $\ce{^{191}Ir}$ $\endgroup$ Commented Sep 17, 2014 at 11:33