Question

8. When nitrogen gas reacts with hydrogen gas, ammonia gas is formed. If 0.95 g of hydrogen gas react with 4.75 g of nitrogen gas, which reactant will be the limiting reactant?
1 point
a. nitrogen gas
b. hydrogen gas
c. ammonia gas
d. Neither will be the limiting reactant.
e. The excess reactant must be determined experimentally.

Answer 1

The balanced equation is:

3H₂ + N₂ --> 2NH₃

n (H₂) = 0.95g / 2.02g/mol = 0.47 mol

n (N₂) = 4.75g / 28.02g/mol = 0.17 mol

The actual mole ratio is H₂ : N₂ = 0.47 : 0.17 = 2.76.

According to the equation, the H₂ : N₂ ratio equals 3. Therefore, H₂ is the limiting reactant.

Answer: b) - Hydrogen gas.