Respuesta :
Answer:
Explanation:
Given parameters:
Mass of oxygen atom = 15.994914amu
Mass of a proton = 1.00728amu
Mass of a neutron = 1.00866amu
Unknown:
Mass defect = ?
From the periodic table, the number of the elementary particles in a neutral Oxygen atom is given below:
Number of protons = 8
Number of neutrons = 8
Number of electrons = 8
Solution
The mass defect examines the difference between the actual mass of an atom and sum of masses of the nucleons.
The mass of an atom is concentrated in the nucleus which contains protons and neutrons. Electrons have little to no weight compared with the nucleons.
To calculate the mass defect, we first know the mass of the nucleons first:
1 proton has a mass of 1.00728amu
8 protons will weigh: (8 x 1.00728)amu = 8.05824amu
For the neutrons:
1 neutron has a mass of 1.00866amu
8 neutrons will weigh: (8 x 1.00866)amu = 8.06928amu
Mass of the nucleons = mass of protons + mass of neutrons
= 8.05824amu + 8.06928amu
= 16.12752amu
The mass defect = mass of the nucleons - mass of the atom
= 16.12752amu - 15.994914amu
= 0.132606amu ≅ 0.13261amu to 5 decimal places
Mass defect refers to difference between the mass of an isotope and its mass number which represents the binding energy. The mass defect for oxygen-16 in given data is 0.13261amu
What is isotope?
The element that contain equal numbers of protons but different numbers of neutrons in their nuclei is called isotope.
They differ in relative atomic mass and are same in chemical properties.
The mass defect for oxygen-16 is:
Given that
- Mass of oxygen = 15.994914amu
- Mass of a proton = 1.00728amu
- Mass of a neutron = 1.00866amu
To find:
Mass defect = x
According to the periodic table, the number of the elementary particles in a neutral Oxygen atom is given as:
- Number of protons = 8
- Number of neutrons = 8
- Number of electrons = 8
The mass of an atom is summed up in the nucleus which contains protons and neutrons. Electrons have little weight.
To calculate the mass defect, the mass of the nucleons is as follows:
- 1 proton has a mass of 1.00728amu
- 8 protons will weigh: (8 x 1.00728)amu = 8.05824amu
For the neutrons:
- 1 neutron has a mass of 1.00866amu
- weight of 8 neutrons will be: (8 x 1.00866)amu = 8.06928amu
- Mass of the nucleons = mass of protons + mass of neutrons
- Mass of the nucleons = 8.05824amu + 8.06928amu
- Mass of the nucleons= 16.12752amu
- The mass defect = nucleons mass - atomic mass
- The mass defect = 16.12752amu - 15.994914amu
- The mass defect = 0.132606amu ≅ 0.13261amu
Thus, the mass defect for oxygen-16 according to given data is 0.13261amu.
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