How many atoms are in 0.500 g of Magnesium Chloride?

3.16 × 10²¹ atoms MgCl₂

General Formulas and Concepts:

Explanation:

Step 1: Define

0.500 g MgCl₂ (Magnesium Chloride)

Step 2: Define conversion

Molar Mass of Mg - 24.31 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of MgCl₂ - 24.31 + 2(35.45) = 95.21 g/mol

Avagadro's Number: atoms

Step 3: Dimensional Analysis

= 3.16248 × 10²¹ atoms MgCl₂

Step 4: Check

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

3.16248 × 10²¹ atoms MgCl₂ ≈ 3.16 × 10²¹ atoms MgCl₂

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