Question

Suppose a piece of silver jewelry contains 7.49x10^22 atoms of silver (Ag). how many moles of silver are in the jewelry?​

Answer 1

0.124 mol Ag

General Formulas and Concepts:

Atomic Structure

• Moles

Stoichiometry

• Using Dimensional Analysis

Step-by-step explanation:

Step 1: Define

[Given] 7.49 × 10²² atoms Ag

[Solve] mol Ag

Step 2: Identify Conversions

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

Step 3: Convert

1. [DA] Set up:
   `\displaystyle 7.49 \cdot 10^(22) \ atoms \ Ag((1 \ mol \ Ag)/(6.022 \cdot 10^(23) \ atoms \ Ag))`
2. [DA] Divide [Cancel out units]:
   `\displaystyle 0.124377 \ mol \ Ag`

Step 4: Check

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

0.124377 mol Ag ≈ 0.124 mol Ag

Topic: AP Chemistry