2. How many moles of Hydrogen gas are needed to produce 4 moles of water? 2 H2(g) + 1 O2(g) → 2 H2O(l)

4 mol H₂

General Formulas and Concepts:

Atomic Structure

Reading a Periodic TableMoles

Aqueous Solutions

States of matter

Stoichiometry

Using Dimensional AnalysisAnalyzing reactions RxN

Explanation:

Step 1: Define

[RxN - Balanced] 2H₂ (g) + O₂ (g) → 2H₂O (l)

[Given] 4 mol H₂O

[Given] mol H₂

Step 2: Identify Conversions

[RxN] 2 mol H₂ (g) → 2 mol H₂O (l)

Step 3: Stoichiometry

[DA] Set up conversion:                                                                                   [DA] Multiply [Cancel out units]:                                                                      

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