To calculate for the number of moles of the gas, we need a relation to relate the
number of moles (n), pressure (P), and temperature (T) with volume (V). There are a number of equations that available for use. However, some of these equation are complex which needs other parameters. For simplicity, we assume the gas is an ideal gas. So, we use PV=nRT.
PV = nRT where R is the universal gas
constant
n = PV / RT
n = (0.914 atm) (0.325 L) / (0.08205 L-atm / mol-K) (19 + 273.15 K)
n = 0.0124 mol
Therefore, for the given conditions, we will have 0.0124 mol of gas.
