Gram Atomic Mass
Gram Atomic Mass
Atomic Mass: According to Dalton’s, each element has a characteristic atomic mass. But determining the mass of an individual atom was a relatively difficult task due to its very small size. Hence, their relative atomic masses were determined using the laws of chemical combinations and the compounds formed. For this purpose, initially 1/16 of the mass of an atom of naturally occurring oxygen was taken as standard unit because of the following two reasons:
However in 1961, carbon (C- 12 isotope) was chosen as standard reference for measuring atomic masses universally because C-12 isotope of Carbon is the most abundant.
Gram atomic mass is the atomic weight on the periodic table of an element in grams. It is the mass of 1 mole of an element in grams, which is its moalr mass.
Examples of values expressed in Gram atomic mass :
Which of the following are correct ? (a) A carbon-12 atom is defined as having a mass of 12 u and its gram atomic mass is 12 grams. (b) Sodium has atomic weight of 22.99 u, so it has a gram atomic mass of 22.99 grams.
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| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) Oxygen reacted with a large number of elements and formed compounds. (b) A hydrogen-1 atom has a mass of 2 u (or Da or amu) and its gram atomic mass is 2 grams. (c) A carbon-12 atom is defined as having a mass of 12 u and its gram atomic mass is 12 grams. (d) Sodium has atomic weight of 25 u, so it has a gram atomic mass of 25 grams.
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| Right Option : B | |||
| View Explanation | |||
Which isotope of Carbon is chosen as standard reference for measuring atomic masses universally? | |||
| Right Option : B | |||
| View Explanation | |||
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