(solved)Question 1.30 of NCERT Class XI Chemistry Chapter 1

What will be the mass of one 12C atom in g?
(Rev. 19-Mar-2024)

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Parveen,

Question 1.30
NCERT Class XI Chemistry

What will be the mass of one 12C atom in g?

by Measurements (method 1)

by spectroscopic measurements, the mass is 1.992648 x 10^-23 kg

by Mole Concept (method 2)

Molar mass of 12C = 12.00 g/mol

Hence, 6.022 x 10^23 atoms of 12C have mass = 12.00 g

therefore, 1 atom of 12C has mass = 12.00/(6.022 x 10^23) = 1.992648 x 10^-23 kg Ans!

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