Question

2Na + Cl2 → ?NaCl
In the reaction, sodium and chlorine combine to produce sodium chloride. In an instance when eight sodium chloride molecules are produced, how many diatomic chlorine molecules went into the reaction?

eight
one
two
four

Answer 1

Balance the equation by replacing the ? with a 2.
2Na + Cl2 → 2NaCl
The balanced equation allows you to use the coefficients to convert any amount of one ingredient to an equivalent amount of any other in the same equation. It's done like this.
8 NaCl molecules x (1 mol Cl2/2 moles NaCl) = 8*1/2 = ?
Looks like 4 to me.

Answer 2

dr bob is correct, the answer is 4

Answer 3

Z do you have the other answer...