Question

Plz help...Thanks.
According to the table above, about how much mass would a nucleus that is composed of 15 protons and 18 neutrons have?

18 amu
33 amu
23 amu
15 amu

Answer 1

Answer: B) 33 amu

Explanation:

According to the table, the mass of a proton is 1.0073 amu and the mass of a neutron is 1.0087 amu.

To find the mass, we have to perform the following calculation:

15 x 1.0073 + 18 x 1.0087 = 33.2661  amu

Rounding up, the approximate mass of the nucleus is 33 amu.