Silicon has three naturally occurring isotopes (Si-28, Si-29…

Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The atomic mass and natural abundance of Si-28 are 27.9769 amu and 92.2 %, respectively. The atomic mass and natural abundance of Si-29 are 28.9765 amu and 4.67 %, respectively. Find the natural abundance of Si-30. Express your answer numerically using three significant figures. 

Iridium has only two naturally occurring isotopes. The mass…

Iridium has only two naturally occurring isotopes. The mass of iridium-191 is 190.9605 amu and the mass of iridium-193 is 192.9629 amu . Use the atomic mass of indium to calculate the relative abundance of iridium-193. Enter a numerical answer only, but in terms of percentage.

Copy and paste special symbols as needed to translate the fo…

Copy and paste special symbols as needed to translate the following sentences into French. ÀÂÄÇÈÉÊËÎÏÔŒÙÛÜ àâäçèéêëîïôœùûü   1. I am a student. 2. My major is (or I study) _the name of your major_ 3. You (polite) are from Gainesville.