What is the most common isotope of lithium?

In which reaction is precipitation occurring?

The msds for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. it reacts with bases, various metals, and strong oxidizing agents. its vapors can form explosive mixtures with air.

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2