chemistry question I dont get

Question

How long does it take a person at rest to breathe one mole of air if the person breathes 85.0mLs^-1  of air that is measured at 25 C and 755 torr?   the answer should be in second

please help I do not get this show all the work please I'm confuse



Answer 1

First, let us calculate the volume of air using the ideal gas law PV = nRT

V = 1 mole x 0.082 L-atm/mole-deg x 298 K / (755/760) atm = 24.6 Liters or 24600 mL of air.

If the person breathes at the rate of 85.0 mL/s then the time it takes to breathe one mole would be

24600 mL / 85.0 mL /sec. or about 289 sec.