CBSE Class 9 Answered
Gram Atomic Mass is defined as the mass of a definite quantity of an atom whose numeric value is equal to its relative atomic mass.This definite quantity of atoms is called Avagadro' No. Using the given information find the absolute (actual) value of 1 amu.
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Asked by m.goenka1999 | 26 Jan, 2015, 05:03: PM
Expert Answer
Dear m.goenka1999@gmail.com
Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
How many carbon-12 atoms are needed to have a mass of exactly 12 g. That number is NA - Avogadro's number. Thus, NA is defined by
NA x (mass of carbon-12 atom) = 12 g
The atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12 atom. Consequently we have the relation
NA x 12 amu = 12 g
From the above equation we get 1 amu = 1g/NA or 1 amu = 1.66054x10-24 g.
Regards
Topperlearning Team.
Answered by Arvind Diwale | 26 Jan, 2015, 06:30: PM
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