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 3 g of hydrogen
gas?
3. Which postulate of Dalton's
atomic theory is the result of the
law of conservation of mass?
4. Which postulate of Dalton's
atomic theory can explain the law
of definite proportions?
​

Answer 1

Answer:

2.1 g of hydrogen reacts with = 8 g of oxygen

∴ 3 g of hydrogen reacts with = 8 × 3 = 24 g of oxygen

Thus, 24 g of oxygen gas would be required to react completely with 3 g of hydrogen gas.

3.The postulate that “atoms can neither be created nor destroyed in a chemical reaction” is the result of the law of conservation of mass.

4.The postulate that “A chemical compound always consists of the same elements combined together in the same proportion by mass” is the law of definite proportions.

Answer 2

Answer:

. 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 3 g of hydrogen gas? Thus, 24 g of oxygen gas would be required to react completely with 3 g of hydrogen gas.

which postulate of Dalton's atomic theory can explain the law of definite proportions

Law of definite proportion states that the elements are always present in definite proportions by mass