A) Calculate the total mass of the protons and electrons in 19 9F. Use 1.007825

Question

A) Calculate the total mass of the protons and electrons in 19  9F.
Use 1.007825 amu as the mass of 11H (mass of a proton and an electron).

Express your answer in atomic mass units to 6 significant figures.

B) Calculate the total mass of the neutrons in 19  9F.
Use 1.008665 amu as the mass of 10n (mass of a neutron).

Express your answer in atomic mass units to 7 significant figures.

C)

Calculate the mass defect of 19  9F.
Use 18.9984 amu as the actual mass of 19  9F.

Express your answer in atomic mass units to the fourth decimal place.

Explanation / Answer

A) 19F9 contains 9 protons and 9 electron

therefore total mass of the protons and electrons in 19F9 = 9 x mass of 1H1 (mass of a proton and an electron).

= 9 x 1.007825 amu = 9.07043 amu

B) 19F9 contains 10 neutrons

so total mass of the neutrons in 19F9 = 9 x mass of 1n0 = 10 x 1.008665 amu = 10.08665 amu

C) Mass defect =

[total mass of the protons and electrons in 19F9 + total mass of the neutrons in 19F9 ] - Actual mass of 19F9

= (9.07043 amu + 10.08665 amu) - 18.9984 amu = 0.1587 amu

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