46. The article “The Incorporation of Uranium and Silver by Hydrothermally Synthesized Galena” (Econ. Geology, 1964: 1003–1024) reports on the determination of silver content of galena crystals grown in a closed hydrothermal system over a range of temperature. With x
crystallization temperature in °C and y
Ag2S in mol%, the data follows:

from which
xi
6130,
x 2 i
3,022,050,
yi
4.73,

y 2 i
2.1785,
xi yi
2418.74,
ˆ 1
.00143,
ˆ 0
.311, and s
.131.