Respuesta :

Space

Answer:

1.43 × 10⁻²⁰ mol Li

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

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

Explanation:

Step 1: Define

8.63 × 10³ atoms Li

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

  1. Set up:                              [tex]\displaystyle 8.63 \cdot 10^3 \ atoms \ Li(\frac{1 \ mol \ Li}{6.022 \cdot 10^{23} \ atoms \ Li})[/tex]
  2. Multiply/Divide:                [tex]\displaystyle 1.43355 \cdot 10^{-20} \ moles \ Li[/tex]

Step 4: Check

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

1.43355 × 10⁻²⁰ mol Li ≈ 1.43 × 10⁻²⁰ mol Li

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