The ideal gas law

Question

What volume of oxygen gas will fill a balloon that is at a pressure of 728 mmHg, at standard temperature?the number of moles oxygen gas is 0.89mol

Answer 1

Ideal gas law: PV = nRT

P = pressure in atm = 728 mm Hg x 1 atm / 760 mm Hg = 0.9579 atm

V = volume in L = ?

n = moles = 0.89 mol

R = gas constant = 0.0821 Latm/Kmol

T = temperature in Kelvin = 273K (standard temp)

Solving for V, we have ...

V = nRT/P = (0.89)(0.0821)(273) / 0.9579

V = 20.8 L = 21 L (2 sig.figs.)