Question

Help me please!! I don’t understand

Answer 1

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

Step-by-step 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((1 \ mol \ Zn)/(6.022 \cdot 10^(23) \ atoms \ Zn))((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