Chemistry, 31.08.2019 05:30 megankbrown5

Complete the sentence to explain why the atomic weight of carbon is reported as 12.011 in the table of elements and the periodic table in the front inside cover of the textbook.

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The relative atomic mass of carbon isn't 12 exactly because the weight of one of the isotopes of carbon, carbon-13 is taken into account as well; this has an abundance of about 1.1%.

Answer from: alexanderavrett

The average mass of a carbon atom 12.011, is the average of the masses of all the isotopes ¹²C and ¹³C

Further explanation

The elements in nature have several types of isotopes

Isotopes are atoms whose atomic number has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu

So the atomic mass is obtained is the mass of the atom relative to the 12th carbon atom

An atomic mass unit = amu is a relative atomic mass of 1/12 the mass of an atom of carbon-12.

The 'amu' unit has now been replaced with a unit of 'u' only

The natural abundance of ¹⁴C, ¹⁰C and ¹¹C is so small that we use the isotopes of ¹²C and ¹³C to calculate the average mass of a carbon atom

The average atomic mass is the average of the masses of all

the isotopes

Average atomic mass X = mass isotope 1. % + isotope mass 2.%

The natural abundance of ¹³C is 1.11%, and the natural abundance of ¹²C is 98.89%

The mass of ¹²C is 12 amu.

the mass of ¹³C is 13.003355 amu

so that:

average atomic mass C = (0.9889 x 12 amu) + (0.0111 x 13.00335 amu)

= 11.8668 + 0.1443

= 12,011 amu

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Keywords : the isotope, C, atomic number , mass number

Complete the sentence to explain why the atomic weight of carbon is reported as 12.011 in the table

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Complete the sentence to explain why the atomic weight of carbon is reported as 12.011 in the table...

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