Question

Which chemical equation is balanced to show that mass is conserved during the reaction?

A. H2 + Cl2 -> HCl
B. H2 + O2 -> H2O
C. H2 + Cl2 -> 2HCl
D. H2 + O2 -> 2H2O

Answer 1

Answer: C

Step-by-step explanation:

Mass of conservation means the matter is created nor destroyed. So the same amount of atoms should be produced.

A. is wrong because there are 2 hydrogen atoms and 2 chlorine atoms however there is only one hydrogen and chlorine atom. Where did the other two atoms go? This fails to prove mass is conserved. This reason is similar to B.

D. could be mistaken as the correct answer because there are 2 H and O however the coefficient in front of elements are not formatted quickly. The correct way would be H_2O_2

C. Is the correct answer because having the 2 in front of HCl shows there 2 molecules of HCl in total there would be 2 H atoms and 2 Cl atoms