Calculator
A carbon atom has a relative atomic mass
of 12.9.
35% of the carbon atom has a mass
number of 12.3.
25% of the carbon atom has a mass
number of 13.6.
The remaining 40% has a mass number
which is not known.
Calculate the mass number of the carbon
isotope which is 40% of the Carbon 12.9
atom.
Give your answer to 2 decimal places if
needed.
Mass number =