Chemistry
posted by Lauren .
A pocket of gas is discovered in a deep drilling operation. The gas has a temperature of 480c and is at a pressure of 12.8 atm. What volume of gas is required to provide 18.0 L of gas at the surface where the conditions are 22 C and 1.00 atm?

Use PV = nRT and solve for n at the "pocket" conditions. Then PV = nRT again and substitute the surface conditions but use n from the first calculation.
Alternatively, you may use P1V1/T1 = P2V2/T2