Question

How many moles are there if you have.
a. 6.80 x 1024 molecules of Ba(NO3)2

Answer 1

11.3 mol Ba(NO₃)₂

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

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

• Left to Right

Chemistry

Atomic Structure

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

Step-by-step explanation:

Step 1: Define

6.80 × 10²⁴ molecules Ba(NO₃)₂

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

1. Set up:
   `\displaystyle 6.80 \cdot 10^(24) \ molecules \ Ba(NO_3)_2((1 \ mol \ Ba(NO_3)_2)/(6.022 \cdot 10^(23) \ molecules \ Ba(NO_3)_2))`
2. Multiply:
   `\displaystyle 11.2919 \ mol \ Ba(NO_3)_2`

Step 4: Check

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

11.2919 mol Ba(NO₃)₂ ≈ 11.3 mol Ba(NO₃)₂