Answer:
The reaction produces 4.91 x 10²³ molecules of H₂O.
Explanation:
Remember first the meaning of "mol". A mol always represents the amount of particles equal to 6.022 x 10²³, which is called Avogadro's number.
For example: If we have 1 mol of books that means that we have 6.022 x 10²³ books which is the same as 602200000000000000000000 books (a huge amount of books!)
Now, let's analyze the problem:
- H₂O is <u>a molecule of water</u>, and to know how many molecules are in 0.815 <u>moles of water</u>, it is necessary to use the Avogadro's number.
- To solve this problem we have to think about the relation between the Avogadro's number and the number of moles so we use the "Rule of three" thinking that: if <u>1 mole of water</u> has <u>6.022 x 10²³ molecules of water</u>, the <u>0.815 moles of water</u> that we have, will be the result of multiplying 0.815 by 6.022 x 10²³ and dividing that result by one.
- After applying the Rule of three, we finf that the reaction produces <u>4.91 x 10²³ molecules of water</u>.