MEDIUM
9th CBSE
IMPORTANT
Earn 100

During an experiment, hydrogen H2 and oxygen O2 gases are reacted in an electric arc to produce water as follows: 2H+O2Electricity2H2O
The experiment is repeated three times and data tabulated as shown below:

Experiment number Mass of H2 reacted Mass of O2 reacted Mass of H2O produced
1 2g 16g 18g
2 4g 32g 36g
3 - - 9g
During 3rd experiment the researcher forgot to list masses of H2 and O2 used. So, if the law of constant proportion is correct then find mass of O2 used during 3rd experiment.

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Important Questions on Atoms and Molecules

HARD
9th CBSE
IMPORTANT
Nitrogen and hydrogen combine together to form ammonia.
N2+3H22NH3
Relative atomic masses of N=14u,H=1u
The mass of nitrogen and hydrogen which combine together to form 6.8g ammonia is
HARD
9th CBSE
IMPORTANT
Which of the following correctly represents 360g of water?
I. 2 moles of H2O
II. 20 moles of water
III. 6.022×1023 molecules of water
IV. 1.2044×1025 molecules of water
HARD
9th CBSE
IMPORTANT
3.42g of glucose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution is
HARD
9th CBSE
IMPORTANT
Which of the following contains the maximum number of molecules?