Answer:
204.5 molecules
Explanation:
Pressure, P = 1.01 x 10^-13 Pa
Volume, V = 9.28 cm^3 = 9.28 x 10^-6 m^3
Temperature, T = 332 K
Gas constant, R = 8.314 in MKS system
Let n be the number of moles
Use ideal gas equation
P x V = n x R x T
1.01 x 10^-13 x 9.28 x 10^-6 = n x 8.314 x 332
n = 3.396 x 10^-22
According to the Avagadro's law
1 mole of the substance contains = 6.023 x 10^23 molecules
so, 3.396 x 10^-22 moles contains = 6.023 x 10^23 x 3.396 x 10^-22
= 204.5 molecules
