Find the pressure of an ideal gas at a temperature of 23 degrees Celsius and a concentration of 2 * 10 ^ 23 m ^ -3.

Let us give the values from given in the SI system:
T = 23C ° = 296 K
Ideal gas equation of state
P = nkT, where n is the gas concentration, k is the Boltzmann constant k = 1.38 * 10 ^ -23, T is the gas temperature.
Substitute the numerical values and calculate the pressure:
P = n * k * T = (2 * 10 ^ 23) * (1.38 * 10 ^ -23) * 296 = 817 Pa
Answer: gas pressure 817 Pa.