In calcium hydroxide (Ca(OH)₂), how many atoms of hydrogen are present in one molecule?

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Multiple Choice

In calcium hydroxide (Ca(OH)₂), how many atoms of hydrogen are present in one molecule?

Explanation:
In a molecule of calcium hydroxide (Ca(OH)₂), the chemical formula indicates that there are two hydroxide (OH) groups. Each hydroxide ion contains one oxygen atom and one hydrogen atom. Since there are two hydroxide groups in the formula, you multiply the number of hydrogen atoms per hydroxide by the number of hydroxides present. This means that for each OH group, there is one hydrogen atom. Therefore, with two hydroxide groups, the total number of hydrogen atoms is 2 (1 from each OH). This is why the correct answer is that there are two atoms of hydrogen present in one molecule of calcium hydroxide.

In a molecule of calcium hydroxide (Ca(OH)₂), the chemical formula indicates that there are two hydroxide (OH) groups. Each hydroxide ion contains one oxygen atom and one hydrogen atom. Since there are two hydroxide groups in the formula, you multiply the number of hydrogen atoms per hydroxide by the number of hydroxides present.

This means that for each OH group, there is one hydrogen atom. Therefore, with two hydroxide groups, the total number of hydrogen atoms is 2 (1 from each OH). This is why the correct answer is that there are two atoms of hydrogen present in one molecule of calcium hydroxide.

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