Analysis of argon-40 in a rock sample using a mass spectrometer was performed. It was found out that it contains 74% by mass of argon-40. Assuming that all argon came from the reaction given above, the potassium-40 present in the sample is 26% of its amount at the time when the rock was formed. Estimate the age of the rock given that the half-life of potassium-40 is 1.2 billion years.

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.