Difficulty: Hard

Average Score: 40%

Which of the following statements is most accurate regarding the compound 2H₂O?

Rationale

2H₂O represents two water molecules.

The notation 2H₂O indicates that there are two molecules of water, each composed of two hydrogen atoms and one oxygen atom. This notation is a standard way to represent the quantity of molecules in chemical formulas.

A (2H₂O has a total of 2 hydrogen atoms.) YOUR ANSWER

This statement is incorrect because 2H₂O contains a total of 4 hydrogen atoms. Each water molecule (H₂O) consists of 2 hydrogen atoms, so two molecules would contain 2 x 2 = 4 hydrogen atoms.

B (2H₂O represents two water molecules.) CORRECT

This choice is accurate as it correctly interprets the coefficient "2" in front of H₂O, indicating that there are two complete water molecules, each made of two hydrogen and one oxygen atom.

C (H₂O represents two water molecules.) YOUR ANSWER

This statement is false because H₂O represents only one water molecule, consisting of two hydrogen atoms and one oxygen atom. The absence of a coefficient indicates that there is just a single molecule of water.

D (None of the above.) YOUR ANSWER

This option is incorrect because choice B is indeed a valid statement about 2H₂O. Therefore, saying "none of the above" does not hold as there is a correct statement among the choices.

Conclusion

The notation 2H₂O accurately describes two water molecules, reinforcing the understanding of how coefficients in chemical formulas indicate the quantity of molecules present. The other options either misinterpret the molecular composition or fail to recognize the correct representation of water molecules, highlighting the importance of clarity in chemical notation.

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