RushMyPassport.com is registered, but not affiliated, with the US Government. We charge an additional fee to expedite your passport in 1-12 days. If you are not in a rush, you can obtain a passport directly from the U.S. Department of State in 4-7 weeks.e charge an additional fee to expedite your passport in 1-12 days. If you are not in a rush, you can obtain a passport directly from the U.S. Department of State in 4-7 weeks.
Lesson Summary. The atomic mass unit (AMU) is used by scientists to describe the mass of atoms. If you want to convert a mass in grams to AMU, all you need to do is divide by 1.660599 x 10^-24 g/AMU. To unlock this lesson you must be a Study.com Member. Create your account.
The lighter isotope is more common with 69.09% of the naturally occurring copper having a mass of 62.93 amu per atom. The remainder of the atoms, 30.91 %, have a mass of 64.94 amu. To find the AVERAGE ATOMIC MASS of an atom, we take into account all of the isotopes that exist and the percentage of each type.