Marie Curie dissolved 0.091 92 g of RaCl2 and treated it with excess AgNO3 to precipitate 0.08890

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Marie Curie dissolved 0.091 92 g of RaCl2 and treated it with excess AgNO3 to precipitate 0.08890 g of AgCl. In her time (1900), the atomic mass of Ag was known to be 107.8 and that of Cl was 35.4. From these values, find the atomic mass of Ra that Marie Curie would have calculated.
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