Question

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?

Class 9 - Science - Atoms and Molecules Page 33

Answer 1

Heya !


Here is your answer ================================================================================

>> Here we have been given that hydrogen and oxygen always combine in the fixed ratio of 1 : 8 by mass. This means that :


1 g of hydrogen has require = 8 g of oxygen gas

So, 3 g of hydrogen gas require = 8 × 3 g of oxygen gas

= 24 g of oxygen gas


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


Hope it helps !!! : )

Answer 2

Answer:

• It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8.
• Then, the mass of oxygen gas required to react completely with 1 g of hydrogen gas is 8 g.
• Therefore, the mass of oxygen gas required to react completely with 3 g of hydrogen gas is 8 × 3 g = 24 g.