Respuesta :

Space

Answer:

0.0463 mol KCl

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
  • Using Dimensional Analysis

Explanation:

Step 1: Define

3.45 g KCl

Step 2: Identify Conversions

Molar Mass of K - 39.10 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of KCl - 39.10 + 35.45 = 74.55 g/mol

Step 3: Convert

  1. Set up:                              [tex]\displaystyle 3.45 \ g \ KCl(\frac{1 \ mol \ KCl}{74.55 \ g \ KCl})[/tex]
  2. Multiply/Divide:                [tex]\displaystyle 0.046278 \ mol \ KCl[/tex]

Step 4: Check

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

0.046278 mol KCl ≈ 0.0463 mol KCl

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