iron Presence of trace elements, irradiation and iron impurities give the gem amethyst its purplish color!
72g H2O x 1 mol H2O/18.02g H2O = 3.99 mol H2O
The numbers may be off by a few, if you worked it out, since my periodic table is for AP chemistry. Hope this helps!!!
Answer:
They all have the same fundamental properties of reflection
There are 3 sig figs. 8 and 2 are obvious. The ending 0 is significant because it is at the end of a decimal number, and doesn't have to be measured.