How many hydrogen atoms does a molecule of calcium hydroxide contain?
Two
A molecule of calcium hydroxide contains 2 hydrogen atoms.
Here is a quick breakdown of why:
The chemical formula for calcium hydroxide is
$$\text{Ca(OH)}_2$$
.
$$\text{Ca}$$
represents one calcium atom.
$$\text{OH}$$
represents a hydroxide ion, which consists of one oxygen atom and one hydrogen atom.
The subscript
$$2$$
outside the parentheses means everything inside those parentheses is multiplied by two.
So,
$$2 \times 1$$
hydrogen atom = 2 hydrogen atoms (along with 2 oxygen atoms and 1 calcium atom).
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Important Questions from Basic Concepts of Chemistry
- Which law states that a compound always contains the same elements in the same proportion by mass?
- Which of the following is NOT applicable to the Law of Constant Proportion?
- Which of the following best differentiates a mixture from a compound?
- Which of the following is an element?
- Which of the following best defines a heterogeneous mixture?
