Determine the concentration n 0 of hydrogen molecules in the container if the pressure is p = 0.3 kPa

Determine the concentration n 0 of hydrogen molecules in the container if the pressure is p = 0.3 kPa and the temperature is 300 K.

Ideal gas equation of state (Mendeleev – Clapeyron equation):
P = n * k * T, where P is the hydrogen pressure (P = 0.3 kPa = 0.3 * 10 ^ 3 Pa), n is the concentration of hydrogen molecules (m ^ -3), k is the Boltzmann constant (k = 1.38 * 10 ^ -23 J / K)), T is the absolute temperature of hydrogen (T = 300 K).
Let us express and calculate the concentration of hydrogen molecules:
n = P / (n * T) = (0.3 * 10 ^ 3) / ((1.38 * 10 ^ -23) * 300) = 0.725 * 10 ^ 23 m ^ -3.
Answer: The concentration of hydrogen molecules is 0.725 * 10 ^ 23 m ^ -3.