Question

How many moles of atoms are in 8.1 × 10^5
g
Pb?
Answer in units of mol.

Answer 1

3900 mol Pb

General Formulas and Concepts:

Chemistry - Atomic Structure

• Reading a Periodic Table
• Using Dimensional Analysis

Step-by-step explanation:

Step 1: Define

8.1 × 10⁵ g Pb

Step 2: Identify Conversions

Molar Mass of Pb - 207.2 g/mol

Step 3: Convert

`8.1 \cdot 10^5 \ g \ Pb((1 \ mol \ Pb)/(207.2 \ g \ Pb) )` = 3909.27 mol Pb

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

3909.27 mol Pb ≈ 3900 mol Pb