Question

Calculate the relative atomic mass of carbon 13 isotope

Answer 1

Answer:

13 amu

Carbon-13 (13C): The carbon isotope whose nucleus contains six protons and seven neutrons. This gives an atomic mass of 13 amu. six neutrons, resulting in an atomic mass of 12 amu.

Answer 2

Answer:

Carbon-13 (13C): The carbon isotope whose nucleus contains six protons and seven neutrons. This gives an atomic mass of 13 amu.

Explanation:

The nucleus of carbon-13 contains six protons and

seven neutrons, resulting in an atomic mass of 13 amu.

n general, to calculate the "weighted average" mass of an element that occurs naturally as two different isotopes, isotope 1 and isotope 2, then:

"weighted average"

mass of element = (abundance isotope 1 × mass isotope 1) + (abundance isotope 2 × mass isotope 2) /100

If we estimate the mass of each isotope by using its mass number (A), then we can re-write the expression as:

"weighted average"

mass of element = (abundance isotope 1 × A(isotope 1)) + (abundance isotope 2 × A(isotope 2)) /100

Or, put another way:

"weighted average"

mass of element = {(%abundance isotope 1 /100) × A(isotope 1)} + {(%abundance isotope 2 /100) × A(isotope 2)}