Answer
418.2k+ views
Hint: The masses of the individual atoms are very-very small such that it makes difficulty in measurements and it increases complexity while measuring in grams therefore, the comparisons of masses is easier when we choose a reference standard of an element from which all other masses could be compared.
Complete step by step answer:
As we know that we use a standard reference for the calculation of atomic masses of all elements. Therefore, scientists have decided the carbon nucleus as the standard reference from which we can compare masses of all other elements. Therefore, one atom of carbon $ - 12$ is assigned a mass of $12\;amu$ where $amu$ is the atomic mass unit. Therefore, the masses of all other elements are compared with atomic mass units.
Here, one atomic mass unit can be defined as the mass which is equal to the mass of one twelfth of an atom of carbon $ - 12$ that is the most common isotope of carbon atom. The value of one atomic mass unit is equal to $1.66 \times {10^{ - 24}}g$. As the reference standard used for defining atomic mass is carbon $ - 12$.
Hence, option B.) is the correct answer.
Note:
Always remember that if an atom has a mass in grams equal to the one-twelfth of the mass of carbon $ - 12$ atom then that element would have a relative mass of $1amu$(one atomic mass unit). As we know, the mass of a carbon atom in grams is $1.99 \times {10^{ - 23}}g$. And mass of hydrogen in grams is $0.1673 \times {10^{ - 23}}g$ which is approx. equal to the one-twelfth of the mass of the carbon atom. Hence, the mass of hydrogen in $amu$ is $1\;amu$.
Complete step by step answer:
As we know that we use a standard reference for the calculation of atomic masses of all elements. Therefore, scientists have decided the carbon nucleus as the standard reference from which we can compare masses of all other elements. Therefore, one atom of carbon $ - 12$ is assigned a mass of $12\;amu$ where $amu$ is the atomic mass unit. Therefore, the masses of all other elements are compared with atomic mass units.
Here, one atomic mass unit can be defined as the mass which is equal to the mass of one twelfth of an atom of carbon $ - 12$ that is the most common isotope of carbon atom. The value of one atomic mass unit is equal to $1.66 \times {10^{ - 24}}g$. As the reference standard used for defining atomic mass is carbon $ - 12$.
Hence, option B.) is the correct answer.
Note:
Always remember that if an atom has a mass in grams equal to the one-twelfth of the mass of carbon $ - 12$ atom then that element would have a relative mass of $1amu$(one atomic mass unit). As we know, the mass of a carbon atom in grams is $1.99 \times {10^{ - 23}}g$. And mass of hydrogen in grams is $0.1673 \times {10^{ - 23}}g$ which is approx. equal to the one-twelfth of the mass of the carbon atom. Hence, the mass of hydrogen in $amu$ is $1\;amu$.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)