A chemist found a 60.00 gram sample containing copper and oxygen. Given the following percent composition, what is the mass of copper in the sample? Copper- 57.08 %
Oxygen- 42.9296

choose an
O 0.5708 g Cu
o 25.02 g Cu
34.25 g cu
63.5 g Cu

What changes occur in the reaction indicated by the equation? check all that apply. the hydrogen nucleus loses protons. the oxygen nucleus gains protons. the bond in h2 is broken, and new bonds are formed between hydrogen and oxygen atoms. each electron associated with a hydrogen atom is shared with an oxygen atom.