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A 152 grams sample of an isotope of strontium-90 was formed in a 1980 explosion of an atomic bomb at Johnson Island in the

A 152 grams sample of an isotope of strontium-90 was formed in a 1980 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 11 years. In what year will only 19 grams of this strontium-90 remain? Show your work and put your answer in the right significant figures to receive full credit.

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