Question

Help me please!! I don’t understand

Answer 1

Answer:

3.85 g Zn

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

[Given] 3.55 × 10²² atoms Zn

[Solve] grams Zn

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of Zn - 65.39 g/mol

Step 3: Convert

1. [DA] Set up:                                                                                                       $\displaystyle 3.55 \cdot 10^{22} \ atoms \ Zn(\frac{1 \ mol \ Zn}{6.022 \cdot 10^{23} \ atoms \ Zn})(\frac{65.39 \ g \ Zn}{1 \ mol \ Zn})$
2. [DA] Multiply/Divide [Cancel out units]:                                                            $\displaystyle 3.85477 \ g \ Zn$

Step 4: Check

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

3.85477 g Zn ≈ 3.85 g Zn