Final answer:
Yes, copper isotopes have a mass of 63.546 amu. Copper (Cu) has two stable isotopes: 63Cu and 65Cu. The average mass of naturally occurring copper is 63.546 amu, which is a weighted average of these two isotopes.
Step-by-step explanation:
Yes, copper isotopes have a mass of 63.546 amu. However, it is important to note that not all copper isotopes have this exact mass. Copper (Cu) has two stable isotopes: 63Cu (62.929595 g/mol) with an abundance of 69.09% and 65Cu (64.927786 g/mol) with an abundance of 30.91%. The average mass of naturally occurring copper is 63.546 amu, which is a weighted average of these two isotopes.
To calculate the percentage composition of Cu in terms of these two isotopes, we can use the following equation:
Percentage of 63Cu = (mass of 63Cu / average mass of copper) x 100% = (62.929595 g/mol / 63.546 g/mol) x 100% = 98.93%
Percentage of 65Cu = (mass of 65Cu / average mass of copper) x 100% = (64.927786 g/mol / 63.546 g/mol) x 100% = 1.07%