Question

The relative atomic mass of hydrogen is:
A)1
B)1.008
C)1.08
D)1.0008

Answer 1

Hint: We know that relative atomic mass equals the mass of an atom of an element divided by one-twelfth mass of an atom of C-12.
We can obtain the relative atomic mass we have to calculate the mass of 1/12 of carbon-12. We have to compare this value with any other atom that needs to be calculated and the calculated ratio is the relative atomic mass of that atom.
For example, the mass of oxygen atom is $2.657 \times {10^{ - 26}}$ and mass of $1/12$ of the carbon atom is $1.661 \times {10^{ - 27}}\,kg$, when we divide the masses value, we get the relative atomic mass of oxygen as $16$.

Complete step by step answer:
We can define the mass of one atom as the atomic mass. Kilogram is used to express mass, and the non-SI unit of mass is u or 1 Dalton.
One amu or one Dalton is equal to $1.661 \times {10^{ - 27}}\,kg$.
We know the hydrogen atom has a mass of $1.6736 \times {10^{ - 24}}\,g$.
The mass of one twelfth of a carbon atom is $1.661 \times {10^{ - 24}}\,g$.
Let us now divide the mass of the hydrogen atom to the mass of one twelfth of carbon atom.
Relative atomic mass=$\dfrac{{{\text{Mass}}\,{\text{of}}\,{\text{hydrogen}}\,\,{\text{atom}}}}{{{\text{Mass}}\,{\text{of}}\,\dfrac{{\text{1}}}{{{\text{12}}}}\,{\text{carbon}}\,\,{\text{atom}}}}$
Relative atomic mass=$\dfrac{{{\text{1}}{\text{.6736}} \times {\text{1}}{{\text{0}}^{ - 24}}\,g}}{{{\text{1}}{\text{.661}} \times {\text{1}}{{\text{0}}^{ - 24}}\,g}}$
Relative atomic mass=${\text{1}}{\text{.008}}\,{\text{amu}}$
The relative atomic mass of hydrogen atom is obtained as ${\text{1}}{\text{.008}}\,{\text{amu}}$.

Therefore, option (B) is correct .

Note:
We also remember that hydrogen is a unique element and a well-known industrial gas that has many useful applications. Industrially, hydrogen has widespread applications in the field of petroleum refining, fertilizer production, pharmaceuticals, aerospace applications, and so on. Hydrogen gas is a very good reducing agent. Its ability to act as a reducing agent is applied in the field of metallurgy. For the reduction of metal oxides or the prevention of oxidation of metals, hydrogen is very well used. For the production of chemicals such as methanol, hydrochloric acid, etcHydrogen plays an important role.