Question

How many moles are in a 13.7g block of calcium?

Answer 1

0.342 mol Ca

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

• Reading a Periodic Table

Stoichiometry

• Using Dimensional Analysis

Step-by-step explanation:

Step 1: Define

13.7 g Ca

Step 2: Identify Conversions

Molar Mass of Ca - 40.08 g/mol

Step 3: Convert

1. Set up:
   `\displaystyle 13.7 \ g \ Ca((1 \ mol \ Ca)/(40.08 \ g \ Ca))`
2. Multiply/Divide:
   `\displaystyle 0.341816 \ mol \ Ca`

Step 4: Check

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

0.341816 mol Ca ≈ 0.342 mol Ca