In a compound like water, the mass ratio of hydrogen to oxygen is always _____.
Show answer & explanation
Correct answer: B
Explanation
Correct Answer: Option 2 (1:8)
Explanation:
The mass ratio of hydrogen and oxygen in water (H₂O) is 1:8.
The atomic mass of hydrogen is 1 and that of oxygen is 16, so the total mass of H₂O = (2 × 1) : 16 = 2 : 16 = 1 : 8.
Additional Facts:
The chemical formula of water is H₂O.
The mole ratio (by number) is H:O = 2:1, while the mass ratio is 1:8.
This ratio is constant, which reflects the Law of Constant Proportions.
Possible Questions for the Upcoming Exam:
What is the chemical formula of water?
(Answer: H₂O)
What is the ratio of H and O in moles?
(Answer: 2:1)