Question

2H₂(g)+O2(g)→2H₂O(g)

In the reaction above, what volume of hydrogen would be left over when 300 cm³ of oxygen and 1000 cm³ of hydrogen are exploded in a sealed tube?
A. 200 cm³
B. 400 cm³
C. 600 cm³
D. 700 cm³

Answer 1

In this reaction, 700 cm³ of hydrogen would be left over when 300 cm³ of oxygen and 1000 cm³ of hydrogen are exploded in a sealed tube.

Step-by-step explanation:

The balanced chemical equation for the reaction is:
2H₂(g) + O₂(g) → 2H₂O(g)

Using the stoichiometry of the reaction, we can determine that the ratio of hydrogen to oxygen is 2:1. Therefore, for every 2 volumes of hydrogen, 1 volume of oxygen is required.

In this case, we have 1000 cm³ of hydrogen and 300 cm³ of oxygen. Since the ratio is 2:1, we can see that we have twice the volume of hydrogen compared to oxygen. Thus, the excess volume of hydrogen is 1000 cm³ - 300 cm³ = 700 cm³.