Question

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4. In general, what does a subscript (such as the “2" in H2) tell you about the molecule?
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Answer 1

The number of atoms in the molecule.

Step-by-step explanation:

Answer 2

Answer: In
`H_2` molecule, there are 2 atoms of hydrogen present.

Step-by-step explanation:

Coefficients are defined as the numbers that are written in the front of atoms or molecules during a chemical reaction. They represent the number of moles of the substance present in a chemical reaction.

For Example:
`2H_2+O_2\rightarrow 2H_2O`

2 moles of hydrogen gas is reacting with 1 mole of oxygen gas to produce 2 moles of water molecule.

Subscript numbers are defined as the number of atoms of each element present in a compound.

For Example: In
`CO_2`, 2 atoms of oxygen element is there and 1 atom of carbon element is there.

Superscript numbers are defined as the charges of ions reacting in a chemical reaction.

For Example: In
`Ca^(2+)`, 2+ charge is present on calcium ion.

We are given:

A molecule of hydrogen which is
`H_2`

The number '2' is present in subscript, which represents the number of atoms in a molecule or a compound.

Hence, in
`H_2` molecule, there are 2 atoms of hydrogen present.