A 0.50g sample of rock was found to have `2.5 xx 10^(-6)` mol of `._(19)^(40)K (t_(1//2)=1.3 xx 10^(9) "yr")` and `7.5

A 0.50g sample of rock was found to have `2.5 xx 10^(-6)` mol of `._(19)^(40)K (t_(1//2)=1.3 xx 10^(9) "yr")` and `7.5 xx 10^(-6)` mol of `._(20)^(40)Ca` . How old is the rock?
A. `6.5 xx 10^(8)` yr
B. `1.3 xx 10^(9)` yr
C. `2.6 xx 10^(9)` yr
D. `5.2 xx 10^(9)` yr

A 0.50g sample of rock was found to have `2.5 xx 10^(-6)` mol of `._(19)^(40)K (t_(1//2)=1.3 xx 10^(9) "yr")` and `7.5 xx 10^(-6)` mol of `._(20)^(40)

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