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Sagot :
Answer:
1.66 × 10²⁴ atoms Al
General Formulas and Concepts:
Math
Pre-Algebra
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
- Left to Right
Chemistry
Atomic Structure
- Reading a Periodic Table
- Moles
- Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Stoichiometry
- Using Dimensional Analysis
Explanation:
Step 1: Define
[Given] 2.75 mol Al
[Solve] atoms Al
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
- [DA] Set up: [tex]\displaystyle 2.75 \ mol \ Al(\frac{6.022 \cdot 10^{23} \ atoms \ Al}{1 \ mol \ Al})[/tex]
- [DA] Multiply [Cancel out units]: [tex]\displaystyle 1.65605 \cdot 10^{24} \ atoms \ Al[/tex]
Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.65605 × 10²⁴ atoms Al ≈ 1.66 × 10²⁴ atoms Al
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