Find the volume occupied by 18.0 g of helium gas at 29.0 ∘c and 1.33 atm of pressure.

We can use the ideal gas law equation to find the volume occupied by the gas
PV = nRT
where 
P - pressure - 1.33 atm x 101 325 Pa/atm = 134 762 Pa
V - volume 
n - number of moles - 18.0 g / 4 g/mol = 4.5 mol 
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature in Kelvin - 29 °C + 273 = 302 K
substituting these values in the equation 
134 762 Pa x V = 4.5 mol x 8.314 Jmol⁻¹K⁻¹ x 302 K 
V = 83.8 L
volume occupied by He is 83.8 L 

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.

Answer is to avoid experimental error