Home › Junior Science Olympiad › Chemistry › Atoms and Molecules › Decomposing 9 g of water always gives 1 g of hyd…
Decomposing 9 g of water always gives 1 g of hydrogen and how much oxygen?
A8 g
B2 g
C4 g
D6 g
Answer & Solution
Correct answer: A. 8 g
1. The mass ratio in water is one part hydrogen to eight parts oxygen.
2. One gram of hydrogen therefore pairs with eight of oxygen.
3. So 8 g of oxygen is obtained.
_Source: syllabus Science Class IX, Chapter 3, Atoms and Molecules._
Related questions
One mole of any substance contains how many particles, to four figures?The SI unit used for the amount of a substance is the:With Na as 23 and Cl as 35.5, the formula unit mass of common salt is:For sodium chloride, whose particles are ions, chemists calculate the:Using H as 1, N as 14 and O as 16, the molecular mass of nitric acid works out to:Hydrogen has atomic mass 1 u and oxygen 16 u. The molecular mass of water is:Adding up the atomic masses of every atom in a molecule gives its:A group of atoms carrying a charge, such as sulphate, is called a: