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Calculate the number of atoms in 0.25 moles of manganese?

1 Answer

7 votes

Answer:

1.5 × 10²³ atoms Mn

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.

Step-by-step explanation:

Step 1: Define

0.25 mol Mn

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

  1. Set up:
    \displaystyle 0.25 \ mol \ Mn((6.022 \cdot 10^(23) \ atoms \ Mn)/(1 \ mol \ Mn))
  2. Multiply:
    \displaystyle 1.5055 \cdot 10^(23) \ atoms \ Mn

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1.5055 × 10²³ atoms Mn ≈ 1.5 × 10²³ atoms Mn

User Hitesh Rawal
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