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BECE Science 2023 Paper

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Question : 8

Total: 40

How many atoms are present in

\mathrm{H}_2\mathrm{O}_2

5
4
3
2

Solution:

Concept:

A chemical formula tells us the number of each type of atom present in one molecule.

Explanation:

The formula

\mathrm{H}_2\mathrm{O}_2

has subscript

2

after

\mathrm{H}

. This means there are 2 hydrogen atoms.

The subscript

2

after

\mathrm{O}

means there are 2 oxygen atoms.

So, total atoms

= 2 + 2 = 4

.

Answer:

Option B: 4 atoms.

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