Question

Calculate the density of oxygen, O2, under each of the following conditions: STP 1.00 atm and 30.0 ∘C Express your answers numerically in grams per liter. Enter the density at STP first and separate your answers by a comma.

Answer 1

1)

P = 1.0atm

T = 273 K

Molar mass of O2 = 32 g/mol

Lets derive the equation to be used

we have below equation to be used:

p*V=n*R*T

p*V=(mass/molar mass)*R*T

p*molar mass=(mass/V)*R*T

p*molar mass=density*R*T

Put Values:

1.0 atm *32.0 g/mol = density * 0.0821 atm.L/mol.K *273.0 K

density = 1.43 g/L

Answer: 1.43 g/L

2)

P = 1.0atm

T= 30.0 oC

= (30.0+273) K

= 303 K

Molar mass of O2 = 32 g/mol

Lets derive the equation to be used

we have below equation to be used:

p*V=n*R*T

p*V=(mass/molar mass)*R*T

p*molar mass=(mass/V)*R*T

p*molar mass=density*R*T

Put Values:

1.0 atm *32.0 g/mol = density * 0.0821 atm.L/mol.K *303.0 K

density = 1.29 g/L

Answer: 1.29 g/L

Final answer: 1.43, 1.29