Question

L

Answer 1

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

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.