Chapter 3: Atoms and Molecules
Exercise number 33
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?
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.
Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?
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.
Which postulate of Dalton's atomic theory can explain the law of definite proportions?
The Dalton's postulate "The relative number and kind of atoms in a given compound remains constant" can explain the law of definite proportions.