Question

1) How many atoms are in 0.54 moles of Cu? show work ​

Answer 1

Answer:

3.3 × 10²³ atoms Cu

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

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

Stoichiometry

• Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 0.54 moles Cu

[Solve] atoms Cu

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

1. [DA] Set up:                                                                                                      $\displaystyle 0.54 \ mol \ Cu(\frac{6.022 \cdot 10^{23} \ atoms \ Cu}{1 \ mol \ Cu})$
2. [DA] Multiply [Cancel out units]:                                                                     $\displaystyle 3.25188 \cdot 10^{23} \ atoms \ Cu$

Step 4: Check

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

3.25188 × 10²³ atoms Cu ≈ 3.3 × 10²³ atoms Cu