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How many moles of Na3N are there in 56.1 grams of Na3N?
a. 4660 moles

b. 2.46x10^-24 moles

c. 4.07x10^23 moles

d. 0.676 moles

Respuesta :

Space

Answer:

D. 0.676 moles

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 Tables
  • Compounds
  • Moles

Stoichiometry

  • Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 56.1 g Na₃N

[Solve] moles Na₃N

Step 2: Identify Conversions

[PT] Molar Mass of Na - 22.99 g/mol

[PT] Molar Mass of N - 14.01 g/mol

Molar Mass of Na₃N - 3(22.99) + 14.01 = 82.98 g/mol

Step 3: Convert

  1. [DA] Set up:                                                                                                     [tex]\displaystyle 56.1 \ g \ Na_3N(\frac{1 \ mol \ Na_3N}{82.98 \ g \ Na_3N})[/tex]
  2. [DA] Multiply/Divide [Cancel out units]:                                                         [tex]\displaystyle 0.676067 \ mol \ Na_3N[/tex]

Step 4: Check

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

0.676067 mol Na₃N ≈ 0.676 mol Na₃N

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