Challenge: baking powder is a combination of three substances. One is an acid salt, and the other two are other "known" substances in the gizmo. What are these two substances?.

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