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.