Calculate the number of atoms in 0.25 moles of manganese?

1.5 × 10²³ atoms Mn

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Chemistry

Atomic Structure

Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:

Step 1: Define

0.25 mol Mn

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Set up:                              Multiply:                            

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1.5055 × 10²³ atoms Mn ≈ 1.5 × 10²³ atoms Mn

Because it was a dramatically big guy

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.