A carbon-12 atom has a mass of 12.00000 amu. The mass of a proton is 1.00728 amu, and the mass of a neutron is 1.00866 amu. How many protons does the carbon-12 atom have? How many neutrons does the carbon-12 atom have? What is the mass defect of a carbon-12 atom? amu

Answers

Answer 1

Answer: A carbon - 12 atom and a regular carbon atom would have the same number of protons which is 6. So a carbon - 12 atom would have 6 protons. Both, however, would differ in the number of neutrons. Carbon - 12 atom has 6 neutrons. To determine the mass defect of a carbon - 12 atom, we have to add the total mass of protons and the total mass of neutrons and subtract the known mass of a carbon - 12 atom. That would be like this.
6 (1.00728 amu) + 6 (1.00866 amu) = x
6.04368 amu + 6.05196 amu = x
12.09564 amu = x

Then subtract it with 12 amu to get the defect mass

12.09564 amu - 12.00000 amu = y
0.09564 amu = y

So the defect mass would be 0.09564 amu.

Answer 2

Answer:

1) The number of protons in an element defines its atomic number, and for carbon, it is 6. 2) Number of neutrons in a carbon-12 atom is 6. 3) The mass defect of a carbon-12 atom is 0.09564 amu.

To determine the number of protons and neutrons in a carbon-12 atom and the mass defect, we need to use the given atomic masses of a proton and a neutron.

Number of protons in a carbon-12 atom:

Carbon-12 is the most common isotope of carbon, and it contains 6 protons. The number of protons in an element defines its atomic number, and for carbon, it is 6.

Number of neutrons in a carbon-12 atom:

The mass number of an isotope will be the sum of protons as well as neutrons in its nucleus. For carbon-12, the mass number is 12 amu. Since we already know it has 6 protons, the number of neutrons can be calculated as follows:

Number of neutrons = Mass number-Number of protons

Number of neutrons = 12 amu-6 protons

Number of neutrons = 6 neutrons

Mass defect of a carbon-12 atom:

The mass defect is the difference between the actual mass of a nucleus and the sum of the masses of its individual protons and neutrons.

Mass defect = (Mass of protons + Mass of neutrons) - Actual mass of carbon-12

Mass of protons = 6 protons × 1.00728 amu/proton = 6.04368 amu

Mass of neutrons = 6 neutrons × 1.00866 amu/neutron = 6.05196 amu

Actual mass of carbon-12 = 12.00000 amu

Mass defect = (6.04368 amu + 6.05196 amu) - 12.00000 amu

Mass defect = 12.09564 amu - 12.00000 amu

Mass defect = 0.09564 amu

So, the mass defect of a carbon-12 atom is 0.09564 amu.

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