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A sample containing 223Ra (t1/2 = 11.4 days) has an activity of 6.70×105 Bq. A) How...

A sample containing 223Ra (t1/2 = 11.4 days) has an activity of 6.70×105 Bq.

A) How many atoms of 223Ra are present?

B) How many moles of 223Ra are present?

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