Question

How many silicons atoms are there in 0.0356 moles of silicon

Answer 1

2.14 × 10²² atoms Si

General Formulas and Concepts:

Atomic Structure

• Reading a Periodic Table
• Moles

Stoichiometry

• Using Dimensional Analysis

Step-by-step explanation:

Step 1: Define

Identify

[Given] 0.0356 mol Si

[Solve] atoms Si

Step 2: Identify Conversions

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

Step 3: Convert

1. [DA] Set up:
   `\dipslaystyle 0.0356 \ mol \ Si((6.022 \cdot 10^(23) \ atoms \ Si)/(1 \ mol \ Si))`
2. [DA] Multiply [Cancel out units]:
   `\dipslaystyle 2.14383 \cdot 10^(22) \ atoms \ Si`

Step 4: Check

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

2.14383 × 10²² atoms Si ≈ 2.14 × 10²² atoms Si