Covalent bonds can be single, double, or triple. How many electrons are shared in a molecule, like O2 that has a double bond?

4

6

12

2

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume