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January 29, 2015

January 29, 2015

Posted by **lisa** on Tuesday, October 5, 2010 at 8:59pm.

the answer has to be _________a emmisions (which I have no idea what it means)

and I use a chart thing with amount, #H-L, and time passed as the collums.

- chem -
**DrBob222**, Tuesday, October 5, 2010 at 9:22pmI would do something like this.

(Number of half lives = 6/3 = 2.)

2^{n}n = 2^{6/3}= 2^{2}= 4 and

69 mg/4 = 17.25 Po atoms remain. The mass that emitted must be 69mg-17.25mg = 51.75 mg or 0.05175 grams.

I would change that to moles (moles = grams/molar mass) and remember that 1 mole of atoms contains 6.022 x 10^23 atoms.

So moles x 6.022 x 10^23 = ??number of alpha emissions.

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