You and your friend, Bill, are given a rock that you know has some Silicon. Chemistry 11 question?
You and your friend, Bill, are given a rock that you know has some Silicon. You just learned that there are 3 common isotopes of silicon- Silicon-28, Silicon-29, and Silicon-30. Bill suggests that the rock might have equal parts of each isotope. What would be the average mass of Silicon in the rock? How could you check to see if your ideas are correct?*
- skeptikLv 76 months ago
Silicon is an element. Silicon isotopes are also elements. Rocks are made of compounds.
It's impossible to know the average mass of silicon in the rock without knowing what other elements are included in those mineral compounds. Or at least without chemically separating the elemental silicon from those compounds.
If Bill is correct, the average atomic mass of the silicon in the rock would be 29. Confirming it would take more information than the question provides.