Question

Chromium (Cr) can combine with Chlorine (Cl2) to form Chromium chloride (CrCl3). Which equation is a correction representation of this reaction?
2Cr + 3Cl2 --> CrCl3.
Cr + Cl2 --> CrCl3.
2Cr + Cl2 --> CrCl3.
2Cr + 3Cl2 --> 2CrCl3.

Answer 1

Here, You just need to compare the number of atoms at both sides, only option D contains equal number of atom, so it is correct equation.

2Cr + 3Cl2 --> 2CrCl3.

Hope this helps!

Answer 2

Balance the reaction so the same number of each type of atom is on each side. Which option seems balanced to you?