Question

How many hydrogen molecules are needed to produce two H2O molecules

Answer 1

There are 2per molecules But the question is asking for 2 molecules of it so 2x2= 4... 4 is the answer!

Answer 2

There are 2 Hydrogen molecules in H2O

Step-by-step explanation:

if you look at the symbol for Hydrogen (H) you see that there is a number beside it, to the right. That number shows how many molecules there are of that element.

(Sidenote: If there is no number there is only one molecule)

Hope this helped :)