Renew by Mail. You can renew your passport by mail with application DS-82 if you meet the criteria listed on the U.S. Department of State web site. Renew by Mail Checklist. You can also renew your passport by bringing your prepared renewal application to a Post Officeâ¢ location.enew by Mail. You can renew your passport by mail with application DS-82 if you meet the criteria listed on the U.S. Department of State web site. Renew by Mail Checklist. You can also renew your passport by bringing your prepared renewal application to a Post Officeâ¢ location.
Solution: 12/6.022*10^23 = 1.9927*10^-23. We know that carbon 12 has a mass of 12 a.m.u and 1 amu =1.66*10^-24 grams.
The mass number is very close to the actual mass of the atom in amu but it is not exactly equal to the mass for three reasons: 1  The electrons, though very light, do weigh something. 2  The mass of the proton and the neutron arenât exactly 1 amu. The proton weighs 1.0073 amu and the neutron weighs 1.0087 amu.