Question 19

2H₂O represents two water molecules

The statement that 2H₂O represents two water molecules is accurate, as the coefficient "2" indicates that there are two molecules of water in total.

A) 2H₂O has a total of 2 hydrogen atoms

This statement is incorrect because 2H₂O actually consists of 4 hydrogen atoms. Each water molecule (H₂O) contains 2 hydrogen atoms, and with the coefficient of 2, there are 2 x 2 = 4 hydrogen atoms in total.

B) 2H₂O represents two water molecules

This statement is correct. The formula 2H₂O indicates that there are two molecules of water, with each molecule represented by the formula H₂O.

C) H₂O₂ represents two water molecules

This statement is incorrect. H₂O₂ is the chemical formula for hydrogen peroxide, not water. The formula for water is H₂O, which represents one water molecule, not two.

D) None of the above

This option is incorrect as well because statement B is indeed accurate, making this choice false.

Conclusion

The correct answer, B, is definitively right because it accurately describes the representation of two water molecules in the formula 2H₂O. All other options either misinterpret the chemical formulas or provide incorrect information about the number of atoms or molecules involved.