Question

How many molecules are present in one gram of hydrogen?

Answer 1

Hint:The atomic number and atomic weight of hydrogen is 1. A molecule of hydrogen contains 2 atoms of hydrogen.
Complete step-by-step answer:
The atomic weight of hydrogen is 1.
Therefore, one mole of hydrogen contains one gram of hydrogen.
$1\text{ mole = 6}\text{.023 }\times \text{ 1}{{\text{0}}^{23}}$ atoms
Since hydrogen is a diatomic molecule, its atoms are found in pairs.
Amount of molecule $=\text{ 3}\text{.02 }\times \text{ 1}{{\text{0}}^{23}}$
$\therefore \text{ 3}\text{.02 }\times \text{ 1}{{\text{0}}^{23}}$ molecules are present in one gram or one mole of hydrogen.
Additional Information:
The mole is important because it allows chemists to work with the subatomic world with macro world units. Atoms, molecules and formula units are small and very difficult to work with usually. However the mole allows a chemist to work with amounts large enough to use.
Mole provides a bridge between the atom and the macroscopic amount of material that we work with in the laboratory it allows the chemists to weigh out amounts of two substances let us say iron and sulphur such that equal numbers of atoms of iron and Sulphur are obtained.
Mole ratio is defined as a conversion factor between compounds in chemical reaction that is derived from the coefficients of the compounds in a balanced equation. The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.
Atomic number or Proton number we mean the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus.
Note: We should know that, the number of particles which is present in one mole of a substance, is represented by Avogadro number. Mole is considered as the SI unit for the measurement of the amount of substance.