how do i set this up? How many days would it take a 26 g sample of Radium-225 to decay to 10g?

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half life av radium 225=15 daes

10 grams/26 grams=0.384615384

dekae go as e-kt

half life...dekae tu 1/2, so e-kt=1/2

need tu find exponent av e tu get 0.384615

ln(e^-kt)=-kt=ln(0.384615)=-0.9555

ln(1/2)=0.693147

0.9555/0.693147=1.378 half lifes

1.378*15=20.7 daes
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