Answer:
31.5 L
Step-by-step explanation:
Simply use PV=nRT
Convert kPa to atm by using 101.3 kPa = 1 atm
78.5 kPa x (1 atm/101.3 kPa) = .775 atm
Then find moles of O2 where MM = 32 so we have 1.0 moles
Find T in Kelvin = C +273 = 25 + 273 = 298
(.775 atm)(V) = 1.0 moles(0.082 atm x L / mol x K)(298 K)
V = 31.5 L