If a rock sample was found to contain 6.93 x 10^-7 mol of

Last updated: 7/26/2022

If a rock sample was found to contain 6.93 x 10^-7 mol of argon-40, how much potassium-40 would also have to be present for the rock 1.3 x 10^9 years old? The half-life of K-40 is 1.3 x 10^9 years. ______ mol K-40