Incorrect. When performing the calculation, be sure to use percentage in the proper form. For example, use 0.105, not 10.5%. Naturally occurring zirconium exists as five stable isotopes: 90Zr with a mass of 89.905 amu (51.45\%); 91Zr with a mass of 90.906amu (11.22\%); 92Zr with a mass of 91.905amu (17.15\%); 94Zr with a mass of 93.906amu (17.38\%), and 96Zr with a mass of 95.908amu (2.80\%). Calculate the average mass of zirconium