Question: Please help me to solve this using the decay model formula. The half-life of radium is 1690 years. If 40 grams are present now, how

Please help me to solve this using the decay model formula.

The half-life of radium is 1690 years. If 40 grams are present now, how much will be present in 690 years? grams (Do not round until the final answer. Then round to the nearest thousandth as needed.)

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