Chapter 27: Q12P (page 767)
Marie Curie dissolved 0.091 92 g of RaCl2 and treated it with excess AgNO3to precipitate 0.088 90 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.
Short Answer
The atomic mass of Ra is calculated as 225.22 g / mol.