Question

6.25 x 10^22 Molecules of BR2 = ?moles

Answer 1

0.104 mol Br₂

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Chemistry

Atomic Structure

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

Stoichiometry

• Using Dimensional Analysis

Step-by-step explanation:

Step 1: Define

6.25 × 10²² molecules Br₂

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

1. Set up:
   `\displaystyle 6.25 \cdot 10^(22) \ molecules \ Br_2((1 \ mol \ Br_2)/(6.022 \cdot 10^(23) \ molecules \ Br_2))`
2. Multiply/Divide:
   `\displaystyle 0.103786 \ mol \ Br_2`

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.103786 mol Br₂ ≈ 0.104 mol Br₂