(Solved): Copper (Cu) has two common isotopes. One isotope has 34 neutrons and 29 protons, and it accounts fo ...

Copper $(\mathrm{Cu})$ has two common isotopes. One isotope has 34 neutrons and 29 protons, and it accounts for $69.15\%$ of all copper. The other isotope has 36 neutrons and 29 protons and it accounts for $30.85\%$ of all copper. Using the isotopic composition provided, calculate the average atomic mass of copper. Round your answer to the tenths place. average atomic mass: amu