Question

How many moles of hydrochloric acid does
1.505x10^24 atoms of hydrochloric acid make?

Answer 1

Answer:

2.499 mol HCl

General Formulas and Concepts:

Chemistry - Atomic Structure

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

Explanation:

Step 1: Define

1.505 × 10²⁴ atoms HCl (Hydrochloric acid)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

$1.505 \cdot 10^{24} \ atoms \ HCl(\frac{1 \ mol \ HCl}{6.022 \cdot 10^{23} \ atoms \ HCl} )$ = 2.49917 mol HCl

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

2.49917 mol HCl ≈ 2.499 mol HCl