How many total atoms are present in three water molecules?
Answer and explanation
Correct answer: 9
The chemical formula of water is \(H_2O\). Each water molecule contains 2 hydrogen atoms and 1 oxygen atom, making 3 atoms altogether. Therefore, three water molecules contain \(3 \times 3 = 9\) atoms. Option A, 6, counts only the hydrogen atoms in three water molecules, not all atoms. Exam tip: Add the atoms shown in the formula and multiply by the number of molecules.
Frequently asked questions
What is the correct answer to this question?
9
Why is this the correct answer?
The chemical formula of water is \(H_2O\). Each water molecule contains 2 hydrogen atoms and 1 oxygen atom, making 3 atoms altogether. Therefore, three water molecules contain \(3 \times 3 = 9\) atoms. Option A, 6, counts only the hydrogen atoms in three water molecules, not all atoms. Exam tip: Add the atoms shown in the formula and multiply by the number of molecules.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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