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March 2, 2015

March 2, 2015

Posted by **sara** on Sunday, May 11, 2014 at 9:29pm.

I don't understand at all what to do here

- chemistry -
**Devron**, Sunday, May 11, 2014 at 9:45pmUse the following formula:

T1/2 = T*ln(2)/ln(Ao/At)

Where

T1/2=0.03920 years

T=?

Ao=100%

and

At=53.25%

Solve for T:

(T1/2)/[[ln(2)/ln(Ao/At)]= To

To=(0.03920)/[ln(2)/ln(100/53.25)]

Answer contains four significant figures.

- chemistry-Additional Steps -
**Devron**, Sunday, May 11, 2014 at 9:59pmThe answer that is given to you will be in years.

Take To and do the following with it:

To*(365 days/1 year)*(24hrs/1 day)*(60mins/1 Hr)= answer in minutes.

Remember, no more than four significant figures.

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