Answer:
The answer is 2.68x10^21 molecules
Explanation:
The ideal conditions for an ideal gas are the following, in addition to the data provided by the exercise:
T = temperature = 273.15 K
P = pressure = 1 atm
V = volume = 100 cm^3 = 0.1 L
R = ideal gas constant = 0.082 atm*L/mol*K
n = number of moles = ?
the ideal gas formula is as follows:
P*V = n*R*T
Clearing n:
n = P*V/R*T = ((1 atm)*(0.1 L))/((0.082 atm*L/mol*K)*(273.15 K)) = 0.00446 mol
we use Avogadro's number to calculate the number of molecules:
Molecules = 0.00446 mol * 6.022x10^23 molecules/mol = 2.68x10^21 molecules
