76.4 g of water H20 contain how many molecules?

2.55 × 10²⁴ molecules H₂O

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 76.4 g H₂O

[Solve] molecules H₂O

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of H - 1.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

Step 4: Check

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

2.55317 × 10²⁴ molecules H₂O ≈ 2.55 × 10²⁴ molecules H₂O

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