An atom of 125Sn has a mass of 124.907785 amu. Calculate the mass defect (deficit) in amu/atom. Use the masses: mass of 1H atom = 1.007825 amu mass of a neutron = 1.008665 amu 1 amu = 931.5 MeV Give your answer to 4 significant figures and DO NOT use E notation..

Question

contestada

Respuesta :

Mergus Mergus · Answer 1 · 2019-12-06T05:09:28+01:00

Answer:

The mass defect is 1.133 amu/atom

Explanation:

The given element is:- [tex]_{50}^{125}\textrm{Sn}[/tex]

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

Also, atomic number of Sn = 50

Thus, the number of protons = 50

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

125 = 50 + Number of neutrons

Number of neutrons = 75

Mass of neutron = 1.008665 amu

Mass of proton = 1.007825 amu

Calculated mass = Number of protons*Mass of proton + Number of neutrons*Mass of neutron

Thus,

Calculated mass = (50*1.007825 + 75*1.008665) amu = 126.041125 amu

Given, mass = 124.907785 amu

Mass defect = Δm = |126.041125 - 124.907785 | amu = 1.13334 amu

Hence, the mass defect is 1.133 amu/atom