Question

the reaction of 25 ml of n₂ gas with 75 ml of h₂ gas to form ammonia via the equation:
n₂ (g) + 3h₂ (g) → 2nh₃ (g)
will produce ______ ml of ammonia if pressure and temperature are kept constant.
100
200
50
250
150
question 2
1 pts
the formula of nitrobenzene is c₆h₅no₂. the molecular weight of this compound is ______ g/mol.
109.10
43.03
123.11
107.11
3.06

Explanation:

Step1: Determine the limiting reactant

According to Avogadro's law, at constant pressure and temperature, the volume ratio of gases is equal to the mole ratio.
The reaction is \(N_2(g)+3H_2(g)\to2NH_3(g)\). The volume ratio of \(N_2:H_2\) in the reaction is \(1:3\).
We have \(V(N_2) = 25\space mL\) and \(V(H_2)=75\space mL\). The ratio of \(V(N_2):V(H_2)=25:75 = 1:3\), so there is no limiting reactant.

Step2: Calculate the volume of \(NH_3\)

From the reaction equation, the volume ratio of \(N_2:NH_3\) is \(1:2\) (since mole ratio = volume ratio at constant \(P\) and \(T\)).
If \(V(N_2) = 25\space mL\), then \(V(NH_3)=2\times V(N_2)\)
\(V(NH_3)=2\times25\space mL = 50\space mL\)

Answer:

50