Respuesta :

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Answer:

2.49 × 10⁻¹² moles Pb

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

1.50 × 10¹² atoms Pb

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

  1. Set up:                                         [tex]\displaystyle 1.50 \cdot 10^{12} \ atoms \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ atoms \ Pb})[/tex]
  2. Multiply:                                                                                                           [tex]\displaystyle 2.49087 \cdot 10^{-12} \ moles \ Pb[/tex]

Step 4: Check

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

2.49087 × 10⁻¹² moles Pb ≈ 2.49 × 10⁻¹² moles Pb

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