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The found jewelry has a carbon mass of 223 g (HINT: Assume all the carbon is...

The found jewelry has a carbon mass of 223 g (HINT: Assume all the carbon is 12C and determine the number of atoms) and careful measurements show that the remaining 14C has a current decay rate of 18 decays/s. Determine the age of the bone (and presumably the jewelry). Remember, the ratio of 14C to 12C when the animal died was 1.3×10-12 & the half-life of 14C is 5730 y.

I have tried this problem multiple times and have gotten different answers that are wrong please show formulas used and round four significant figures, Thanks

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Rounded to 4 significant figures it is 9343 years

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