When completing an electron configuration, which of the following rules/principals show that you cannot label two electrons as having the same quantum numbers? a
Law of Configuration
b
Aufbau Principle
c
Pauli Exclusion Principle
d
Hund's Rule

C. Pauli Exclusion Principle

Explanation:

Pauli's exclusion basically suggests that you cannot label two electrons as having the same quantum numbers.

The principle is stated as "no two electrons in an atom can have the same set of four quantum numbers".

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%

i believe the answer is a.