A 150.0 mL flask contains 760. g of N2 at 0°C.

Question

What is the pressure in atm?

What is the pressure in torr? Enter your answer in scientific notation.

What is the pressure in psi? Enter your answer in scientific notation.

Answer 1

PV = nRT

P =?

V = 150 ml = 0.150 L

n = moles = 760 g N2 x 1 mol/28 g = 27.14 moles

R = gas constant = 0.0821 L-atm/K-mole

T = temperature = 0ºC + 273 = 273 K

PV = nRT

P = nRT/V = (27.14 mol)(0.0821 Latm/Kmole)(273 K)/0.150 L

P = 4055 atm

P = 4055 atm x 760 torr/1 atm = 3.082x10^6 torr

P = 4055 atm x 14.6959 psi/1 atm = 5.959x10^4 psi

All pressures are calculated to 4 significant figures.