Question

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

Answer 1

2 grams of hydrogen completely reacts with 16 grams of oxygen

3 grams of hydrogen completely reacts with 24 grams of oxygen

Answer 2

SOLUTIONS:

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 gas requires = 8 g of oxygen gas.

So, 3 g of hydrogen gas requires = 8 × 3 g of oxygen gas.

That is, ⇒ 24 g.

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