Question

What is the mass of 2.23 x 1023 atoms of sulfur?

Answer 1

Answer:

11.9 g S

General Formulas and Concepts:

Chem

• Reading a Periodic Table
• Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
• Dimensional Analysis

Explanation:

Step 1: Define

2.23 × 10²³ atoms S

Step 2: Define conversions

Avogadro's Number

Molar Mass of S - 32.07 g/mol

Step 3: Dimensional Analysis

$2.23 \cdot 10^{23} \ atoms \ S(\frac{1 \ mol \ S}{6.022 \cdot 10^{23} \ atoms \ S} )(\frac{32.07 \ g \ S}{1 \ mol \ S} )$ = 11.8758 g S

Step 4: Check

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

11.8758 g S ≈ 11.9 g S