How many formula units make up 21.6 g of magnesium chloride (MgCl2)? Express the number of formula units numerically.

1.37 × 10²³ formula units MgCl₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 21.6 g MgCl₂

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of Mg - 24.31 g/mol

[PT] Molar Mass of Cl - 35.45 g/mol

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

Step 3: Convert

Step 4: Check

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

1.36619 × 10²³ formula units MgCl₂ ≈ 1.37 × 10²³ formula units MgCl₂

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.