This is a gas law stoichiometry problem because you are in conditions other than STP.
Begin by determining how many moles of
(16 g is the molar mass of
Now use the moles in the ideal gas law to convert to volume at non STP values for temperature and pressure.
P = 795 mmHg / 760 mmhg = 1.04 atm
V = ???
n = 2.687 moles
R = 0.0821 atm L/mole K
T = 85 C + 273 = 358 K
PV = nRT converts to v = nrt/P
V = 2.687 moles (0.0821 atm L/mole K) ( 358 K) / 1.04 atm.
all units cancel except Liters (L)
V = 75.9 L
I hope this was helpful.