Problem: Be sure to answer all parts.The radioactive potassium-40 isotope decays to argon-40 with a half-life of 1.2 x 109 years. (a) Write a balanced equation for the reaction. (b) A sample of moon rock is found to contain 16 percent potassium-40 and 84 percent argon by mass. Calculate the age of rock in years. (Assume that all the argon in the sample is the result of potassium decay.) Enter your answer in scientific notation.

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Be sure to answer all parts.

The radioactive potassium-40 isotope decays to argon-40 with a half-life of 1.2 x 109 years. 

(a) Write a balanced equation for the reaction. 

(b) A sample of moon rock is found to contain 16 percent potassium-40 and 84 percent argon by mass. Calculate the age of rock in years. (Assume that all the argon in the sample is the result of potassium decay.) 

Enter your answer in scientific notation.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the First Order Half Life concept. You can view video lessons to learn First Order Half Life. Or if you need more First Order Half Life practice, you can also practice First Order Half Life practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Altomare's class at UCF.