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potassium 40 has a molar mass of 39.964 g/mol and a half life of 1.3x10^9 years....

potassium 40 has a molar mass of 39.964 g/mol and a half life of 1.3x10^9 years. calculate the number of potassium 40 nuclei that have disintegrated and the number remaining after 1 day has elapsed if one begins with a 30.00 mg sample.
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