Answer:
The correct answer is 1.17 moles
Explanation:
The ideal gas equation combines the pressure (P), volume (V), temperature (T) and number of moles of a gas (n):
PV= nRT
R is the gas constant (0.082 L.atm/K.mol)
In this case, we have:
V= 7.2 L
P= 4.0 atm
T= 27ºC + 273 = 300 K
We calculate the number of moles (n) of gas as follows:
n= (PV)/(RT)= (4.0 atm x 7.2 L)/(0.082 L.atm/K.mol x 300 K) = 1.17 mol
