Answer:
2.5 × 10²³ atoms Al
General Formulas and Concepts:
Math
Pre-Algebra
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Chemistry
Atomic Structure
- Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Stoichiometry
- Using Dimensional Analysis
Explanation:
Step 1: Define
42 mol Al
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
- Set up: [tex]\displaystyle 42 \ mol \ Al(\frac{6.022 \cdot 10^{23} \ atoms \ Al}{1 \ mol \ Al})[/tex]
- Multiply/Divide: [tex]\displaystyle 2.52924 \cdot 10^{25} \ atoms \ Al[/tex]
Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
2.52924 × 10²³ atoms Al ≈ 2.5 × 10²³ atoms Al
