Please help I am kinda confused

1.27 × 10²³ molecules SO₂

Explanation:

Step 1: Define

Avagadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of SO₂ = Molar Mass of S + 2 Molar Mass of O

Molar Mass of SO₂ - 64.07 g/mol

Step 2: Use Dimensional Analysis

1.26846 × 10²³ molecules SO₂

Step 3: Simplify

We are given 3 sig figs.

1.26846 × 10²³ molecules SO₂ ≈ 1.27 × 10²³ molecules SO₂

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)