ellan15 ellan15

21-12-2022
Chemistry

contestada

40. If 3.0 g of Sr-90 in a rock sample remained in 1999,
how many grams of Sr-90 were
approximately
present in the original rock sample in 1943? (1) 9.0 g
(2) 6.0 g) 3.0 g (4) 12 g

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