Astronomy homework - due Friday, Express all your answer in atomic mass units, u

Question

Astronomy homework - due Friday, Express all your answer in atomic mass units, u (See below.) There is another fusion process for converting hydrogen into helium in stars that have a mass of more than 1.5 M , where 1 M represents the mass of the sun. I've indicated some of the steps in this process below but left out one of the by-products of each reaction. Please determine what each missing piece must be. The isotope decays by spontaneously emitting an alpha particle (a nucleus.) We can write this decay as Determine the missing isotope produced in this decay process How much mass disappears in this decay. Suppose one could assemble a atom by bringing together six protons, six neutrons, and six electrons. Determine if the mass of the carbon atom produced would have less or more mass than the parts to used to assemble it. The mass of atom is exactly 12.00000 u. A radioactive istope of carbon, is produced in the air when a nucleus is struck by and absorbs a neutron. Write out this nuclear process. What else is produced in this reaction besides ? The masses of atoms and nuclei are usually expressed in terms of atomic mass units (u). Atomic masses of various isotopes:

Explanation / Answer

1) 13N7

0p1

4He2

2)a) 235U92

b) Mass disappeared = 2(1.007276 + 1.008665 + 0.000549)u = 4.03298u

3) Difference in mass = 6(1.007276 + 1.008665 + 0.000549)u - 12u = 12.09894u - 12u = 0.09894u

So, Mass of the produced carbon atom is less.

4) 14N7 + 1n0 = 14C6 + 1p1

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