Question

Determine the mass (in grams) of 2H₂required to completely react 21.2gO₂ in the reaction: 2H₂(g)+O₂(g)→2H₂O(l).

A) 3.6g
B) 7.2g
C) 10.8g
D) 14.4g

Answer 1

To determine the mass of 2H₂ required to completely react with 21.2gO₂, we need to balance the equation and set up a proportion. The mass of 2H₂ is 36.03g, so the correct answer is Option C) 10.8g.

Step-by-step explanation:

To determine the mass of 2H₂ required to completely react with 21.2gO₂, we first need to balance the equation:

2H₂(g) + O₂(g) → 2H₂O(l)

The equation tells us that every 2 moles of H₂ reacts with 1 mole of O₂ to produce 2 moles of H₂O. Using the molar masses given in the information, we can calculate the molar mass of H₂O and set up a proportion to find the mass of 2H₂:

1. 2H₂O = 36.03g
2. 2H₂O / 2H₂ = 36.03g / x
3. x = (36.03g * 2H₂) / 2H₂O
4. x = 36.03g

Therefore, the mass of 2H₂ required to react with 21.2gO₂ is 36.03g. So, the correct answer is Option C) 10.8g.