Science
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Chapter 3: Atoms and Molecules
Class: IX
Exercise number 33
Question 2
Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen
gas would be required to react completely with 3g of hydrogen gas?
Answer 2
It is given that, the ratio of hydrogen and oxygen by mass = 1:8.
Then, the mass of oxygen gas required to react completely with 1g of hydrogen gas = 8g.
Therefore, the mass of oxygen required to completely react with 3g of hydrogen gas
= 8 × 3g = 24 g.
Question 3
Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?
Answer 3
The Dalton's second postulate "Atoms are indivisible particles, which can neither be created nor be destroyed in a chemical reaction" is the result of the law of conservation of mass.
Question 4
Which postulate of Dalton's atomic theory can explain the law of definite proportions?
Answer 4
The Dalton's postulate "The relative number and kind of atoms in a given compound remains constant" can explain the law of definite proportions.
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