Answer:
0.023 moles
Explanation:
Given that:
Pressure = 0.899 atm
Temperature = 24 °C
The conversion of T( °C) to T(K) is shown below:
T(K) = T( °C) + 273.15
So,
T = (24 + 273.15) K = 297.15 K
Volume = 625 mL
Also, 1 mL = 10⁻³ L
So, volume = 0.625 L
Moles of the gas = ?
Using ideal gas equation as:
PV=nRT
where,
P is the pressure
V is the volume
n is the number of moles
T is the temperature
R is Gas constant having value = 0.0821 L.atm/K.mol
Applying the equation as:
0.899 atm × 0.625 L=n × 0.0821 L.atm/K.mol × 297.15 K
⇒n = 0.023 moles