Question

How many atoms of cobalt are in 4 moles of cobalt?

Answer 1

Answer:

2 × 10²⁴ atoms Co

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

• Reading a Periodic Table
• Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

• Using Dimensional Analysis

Explanation:

Step 1: Define

4 mol Co (Cobalt)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

1. Set up:                               $\displaystyle 4 \ mol \ Co(\frac{6.022 \cdot 10^{23} \ atoms \ Co}{1 \ mol \ Co})$
2. Multiply/Divide:                 $\displaystyle 2.4088 \cdot 10^{24} \ atoms \ Co$

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

2.4088 × 10²⁴ atoms Co ≈ 2 × 10²⁴ atoms Co