A 0.50 g sample of rock was found to have 2.5×10−6 mol of 4019K(t1/ – InterviewSolution

1.	A 0.50 g sample of rock was found to have 2.5×10−6 mol of 4019K(t1/2=1.3×109 years) and 7.5×10−6mol of 4020Ca. How old is the rock?
Answer» A $0.50 g$ sample of rock was found to have $2.5 \times 10^{- 6} mol$ of $_{19}^{40} K (t_{1 / 2} = 1.3 \times 10^{9} years)$ and $7.5 \times 10^{- 6} {mol of}_{20}^{40} C a$ . How old is the rock?

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