What mass in kilograms of co2 is needed to fill an 80.0 l tank to a pressure of 150.0 atm at 27.0 c

We can use the ideal gas law equation to find the mass of CO₂
PV = nRT
P - pressure - 150.0 atm x 101 325 Pa/atm = 15 198 750 Pa 
V - volume  - 80 x 10⁻³ m³
n - number of moles 
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature in K - 27 °C + 273 = 300 K
substituting the values in the equation 
15 198 750 Pa  x 80 x 10⁻³ m³ = n x 8.314 Jmol⁻¹K⁻¹ x 300 K
n = 487.5 mol
molar mass of CO₂ is 44 g/mol 
mass of CO₂ - 44 g/mol x 487.5 mol = 21 450 g
mass of CO₂ required is 21.450 kg

I’m guessing you’re more alert to yourself or your surroundings if you’re more concentrated