Percentage by mass of an element in a compound
11th grade (Year 12 in England) · 16 questions · Common Core: NGSS.HS-PS1-7 · England: GCSE Combined Science: Quantitative chemistry
Name
Date
Score/ 16
Question 1
What mass of carbon is in 360 g of C₆H₁₂O₆? (Ar: C = 12, H = 1, O = 16)
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Question 2
Which iron ore gives more iron per tonne: Fe₂O₃ (70 % Fe) or Fe₃O₄ (72 % Fe)?
- A. Fe₃O₄
- B. they give the same
- C. Fe₂O₃
- D. neither contains iron
Question 3
What is the percentage by mass of carbon in carbon dioxide, CO₂? (Ar: C = 12, O = 16) Give 1 decimal place.
Answer%
Question 4
What mass of magnesium is in 80 g of MgO? (Ar: Mg = 24, O = 16)
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Question 5
The percentages by mass of all the elements in a compound always add up to…
- A. the number of atoms
- B. 100 %
- C. the Mr
- D. 50 %
Question 6
What is the percentage by mass of calcium in calcium carbonate, CaCO₃? (Ar: Ca = 40, C = 12, O = 16) Give 1 decimal place.
Answer%
Question 7
What mass of nitrogen is in 40 g of NH₄NO₃? (Ar: N = 14, H = 1, O = 16)
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Question 8
Which iron ore gives more iron per tonne: Fe₂O₃ (70 % Fe) or Fe₃O₄ (72 % Fe)?
- A. Fe₂O₃
- B. neither contains iron
- C. they give the same
- D. Fe₃O₄
Question 9
What is the percentage by mass of sulfur in sulfuric acid, H₂SO₄? (Ar: H = 1, S = 32, O = 16) Give 1 decimal place.
Answer%
Question 10
What mass of calcium is in 1000 g of CaCO₃? (Ar: Ca = 40, C = 12, O = 16)
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Question 11
The percentages by mass of all the elements in a compound always add up to…
- A. 50 %
- B. 100 %
- C. the number of atoms
- D. the Mr
Question 12
What is the percentage by mass of oxygen in water, H₂O? (Ar: H = 1, O = 16) Give 1 decimal place.
Answer%
Question 13
What mass of nitrogen is in 40 g of NH₄NO₃? (Ar: N = 14, H = 1, O = 16)
Answerg
Question 14
The percentages by mass of all the elements in a compound always add up to…
- A. 100 %
- B. 50 %
- C. the number of atoms
- D. the Mr
Question 15
What is the percentage by mass of sulfur in sulfuric acid, H₂SO₄? (Ar: H = 1, S = 32, O = 16) Give 1 decimal place.
Answer%
Question 16
What mass of iron is in 800 g of Fe₂O₃? (Ar: Fe = 56, O = 16)
Answerg
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