Worksheet for calculating percent composition of chemical compounds.

Let’s solve each row step by step to find the percent composition of the specified element in each compound.

The formula for percent composition is:

> Percent Composition = (Mass of Element / Mass of Compound) × 100%

We’ll go row by row, using the given masses.

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Row 1: GeI₄ — Find % of Iodine (I)

- Mass of Iodine = 507.62 g
- Mass of Compound = 580.02 g

→ Percent I = (507.62 / 580.02) × 100
= 0.87517... × 100 ≈ 87.52%

✔ Matches answer key.

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Row 2: Pb(NO₃)₂ — Find % of Lead (Pb)

- Mass of Pb = 207.2 g
- Mass of Compound = 331.2 g

→ Percent Pb = (207.2 / 331.2) × 100
= 0.6256... × 100 ≈ 62.56%

But wait — the answer key says 62.56%, and it’s written as “62.56%” — that matches!

Wait — looking at the image again, the answer shown is 62.56%? Actually, in the image, it says “62.56%” — yes, correct.

Hold on — let me recalculate precisely:

207.2 ÷ 331.2 = ?

Let’s do exact division:

207.2 ÷ 331.2 = 0.6256038647...

×100 = 62.56% → Correct.

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Row 3: Fe(OH)₃ — Find % of Oxygen (O)

First, note: Fe(OH)₃ has 3 oxygen atoms.

Given:
- Mass of O = 48.00 g (since 3 × 16.00 = 48.00)
- Mass of Compound = 106.88 g

→ Percent O = (48.00 / 106.88) × 100
= 0.4491... × 100 ≈ 44.91%

Answer key shows 44.91% — correct.

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Row 4: C₆H — Find % of Carbon (C)

Given:
- Mass of C = 72.06 g (6 × 12.01 = 72.06)
- Mass of Compound = 78.12 g

→ Percent C = (72.06 / 78.12) × 100
= 0.9224... × 100 ≈ 92.24%

Answer key says 92.24% — correct.

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Row 5: AgCl — Find % of Silver (Ag)

Given:
- Mass of Ag = 107.87 g
- Mass of Compound = 143.32 g

→ Percent Ag = (107.87 / 143.32) × 100
= 0.7526... × 100 ≈ 75.26%

Answer key says 75.26% — correct.

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Row 6: HNO₃ — Find % of Nitrogen (N)

Given:
- Mass of N = 14.01 g
- Mass of Compound = 63.01 g

→ Percent N = (14.01 / 63.01) × 100
= 0.2223... × 100 ≈ 22.23%

Answer key says 22.23% — correct.

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Row 7: (NH₄)₂SO₄ — Find % of Sulfur (S)

Given:
- Mass of S = 32.07 g
- Mass of Compound = 132.17 g

→ Percent S = (32.07 / 132.17) × 100
= 0.2426... × 100 ≈ 24.26%

Answer key says 24.26% — correct.

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All calculations match the answer key provided in the image.

Final Answer:
All percent compositions are correctly calculated as follows:
- GeI₄: 87.52% I
- Pb(NO₃)₂: 62.56% Pb
- Fe(OH)₃: 44.91% O
- C₆H₆: 92.24% C
- AgCl: 75.26% Ag
- HNO₃: 22.23% N
- (NH₄)₂SO₄: 24.26% S