Step-by-step explanation:
According to ideal gas equation, product of pressure and volume equals n times R times T.
Mathematically, PV = nRT
where P = pressure
V = volume
n = number of moles
R = gas constant
T = temperature
Therefore, it is given that no. of moles is 16.5 mol, pressure is 3.5 kilopascal equals 0.035 atm (as 1 Kpa = 0.01 atm), temperature is 295 K and R = 0.082
.
Hence, calculate the volume as follows.
PV = nRT

V =

= 11403.85 L
Hence, we can conclude that the volume of the air mattress is 11403.85 liters.