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Chemistry
Question 8
Step 1: dilution
Lesson progress
Explain the core ideas in Question 8.Connect this section to Reactions, Oxidation States, and Stoichiometry.Use the source-supported terminology and relationships accurately.
This lesson develops Question 8 as part of Reactions, Oxidation States, and Stoichiometry. It uses the source curriculum to organize the important facts, relationships, examples, and vocabulary into a focused Stemosphere teaching sequence.
Key idea
Keep the central model in view: Question 8 explains observable patterns by connecting structure, process, evidence, and quantitative relationships.
Definition
Step 1
dilution
C₁V₁ = C₂V₂4.0 × 100 = C₂ × 800C₂ = 0.5 mol/dm³Definition
Step 2
moles acid
Definition
Step 3
Na OH needed
H₂SO₄: Na OH = 1: 20.40 → 0.80 mol Na OHDefinition
Step 4
volume Na OH
In Stemosphere terms, -------------------------------------------------
Definition
Step 1
convert to moles
N₂:11.2 / 22.4 = 0.5 molH₂:22.4 / 22.4 = 1 molDefinition
Step 3
NH₃ produced
2 H₂ → 2 NH₃ (1:1)1 mol H₂ → 1 mol NH₃Volume:1 × 22.4 = 22.4 dm³In Stemosphere terms, ---------------------------
Definition
Step 1
moles Ca CO₃
20 / 100 = 0.2 molDefinition
Step 2
Ca O moles
Definition
Step 3
theoretical mass
Definition
Step 4
percent yield
(8 / 11.2) × 100 = 71.4%