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
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Date
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Question 1
What is the percentage by mass of nitrogen in ammonium nitrate, NH₄NO₃? (Ar: N = 14, H = 1, O = 16) Give 1 decimal place.
Answer%
Question 2
The percentages by mass of all the elements in a compound always add up to…
- A. the number of atoms
- B. 100 %
- C. 50 %
- D. the Mr
Question 3
What mass of calcium is in 200 g of CaCO₃? (Ar: Ca = 40, C = 12, O = 16)
Answerg
Question 4
What is the percentage by mass of carbon in glucose, C₆H₁₂O₆? (Ar: C = 12, H = 1, O = 16) Give 1 decimal place.
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Question 5
Which iron ore gives more iron per tonne: Fe₂O₃ (70 % Fe) or Fe₃O₄ (72 % Fe)?
- A. they give the same
- B. Fe₃O₄
- C. Fe₂O₃
- D. neither contains iron
Question 6
What mass of magnesium is in 80 g of MgO? (Ar: Mg = 24, O = 16)
Answerg
Question 7
What is the percentage by mass of oxygen in water, H₂O? (Ar: H = 1, O = 16) Give 1 decimal place.
Answer%
Question 8
Which compound has the higher percentage by mass of oxygen: water (H₂O) or carbon dioxide (CO₂)? (Ar: H = 1, C = 12, O = 16)
- A. carbon dioxide: 32/44 is about 73 %
- B. they are the same
- C. water: 16/18 is about 89 %
- D. neither contains oxygen
Question 9
What mass of iron is in 320 g of Fe₂O₃? (Ar: Fe = 56, O = 16)
Answerg
Question 10
What is the percentage by mass of iron in iron(III) oxide, Fe₂O₃? (Ar: Fe = 56, O = 16) Give 1 decimal place.
Answer%
Question 11
Which compound has the higher percentage by mass of oxygen: water (H₂O) or carbon dioxide (CO₂)? (Ar: H = 1, C = 12, O = 16)
- A. they are the same
- B. carbon dioxide: 32/44 is about 73 %
- C. water: 16/18 is about 89 %
- D. neither contains oxygen
Question 12
What mass of iron is in 320 g of Fe₂O₃? (Ar: Fe = 56, O = 16)
Answerg
Question 13
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 14
Which compound has the higher percentage by mass of oxygen: water (H₂O) or carbon dioxide (CO₂)? (Ar: H = 1, C = 12, O = 16)
- A. water: 16/18 is about 89 %
- B. neither contains oxygen
- C. carbon dioxide: 32/44 is about 73 %
- D. they are the same
Question 15
What mass of magnesium is in 400 g of MgO? (Ar: Mg = 24, O = 16)
Answerg
Question 16
What is the percentage by mass of oxygen in water, H₂O? (Ar: H = 1, O = 16) Give 1 decimal place.
Answer%
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