Question

How many moles are in 3.113 g of Au?Molar mass of Au=197 g/mol

Answer 1

Answer:

0.0157 g Au

General Formulas and Concepts:

Chemistry

Atomic Structure

• Reading a Periodic Table
• Using Dimensional Analysis

Math

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Explanation:

Step 1: Define

3.113 g Au

Step 2: Identify Conversions

Molar Mass of Au - 197.87 g/mol

Step 3: Convert

$3.113 \ g \ Au(\frac{1 \ mol \ Au}{197.87 \ g \ Au} )$ = 0.015733 g Au

Step 4: Check

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

0.015733 g Au ≈ 0.0157 g Au