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Q.

How many atoms of each element are in the chemical formula?

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a

atoms of

,

atoms of

and

atoms of

.

b

atoms of

,

atoms of

and

atoms of

.

c

atoms of

,

atoms of

and

atoms of

.

d

None of the above

answer is A.

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Detailed Solution

Concept- The calcium hydroxide has two oxygen atoms in it.
The calcium hydroxide contains two hydrogen atoms.
The calcium hydroxide has one calcium atom in it.
Consequently, there are 2+2+1=5 atoms overall in calcium hydroxide.
A mole of calcium hydroxide contains

2 \times 6.023 \times 12.046

atoms of oxygen.
A mole of calcium hydroxide has

2 \times 6.023 \times 12.046

hydrogen atoms.
A mole of calcium hydroxide contains

calcium atoms.
So, the 1 mole of calcium hydroxide contains

atoms of calcium,

atoms of oxygen and

atoms of hydrogen.
Hence, the correct answer is option (1).

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