The biosphere of the earth is made up of what compound? organic or inorganic?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

What’s the theoretical yield of solid lead