Practice Questions for Atoms and Molecules Science Class 9
All samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3 : 8. This is in agreement with the law of ____________.
The number of gram atoms are present in 69 grams of sodium is
Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?
One mole of water corresponds to _________.
class="MsoNormal" style="margin-bottom:6.0pt"> An element Z forms an oxide ZO3.The valency of the element Z is
The mass of 0.2 mole of oxygen atoms is
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