El átomo con número atómico 15 y carga neutra tendrá una configuración electrónica terminal= y el diagrama de orbitales de su configuración electrónica terminal tendrá orbitales. a) 3p^4/3  b) 3p^4/1  c) 3p^4/6

a) 3p⁴/3

Do you mean atomic number 16 (sulfur)?

Its electron configuration is 1s² 2s²2p⁶ 3s² 3p⁴.

Thus,  a neutral sulfur atom will have a terminal electronic configuration = 3p⁴ and the orbital diagram of its terminal electronic configuration will have 3 orbitals (see the image be low).

what are the choices?

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%