Question

The density of oxygen gas at 25 c is 1.458 mg/litre at one atmosphere. at what pressure will oxygen have density twice the value

Answer 1

D = pm÷ RT
D = 2D = 2× 1.458 = 2.1257

P = D RT ÷ M
P = 2.1257 × 0.0821 × 298 ÷ 32
P = 1.625 atm


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Answer 2

Answer:

At 0.00223 atm pressure oxygen will have density twice the value.

Explanation:

Density of oxygen gas at 25°C and 1 atm pressure = 1.458 mg/L= 0.001458 g/L

On doubling the density of oxygen gas =2 × 0.001458 g/L= 0.002916 g/L

$\frac{Pressure\times \text{Molar mass}}{RT}=\frac{Mass}{Volume}=Density$

R = Universal gas constant

T = Temperature in Kelvins

Pressure when the density get doubled = P

Temperature of the oxygen gas = 25°C = 298.15 K

$\frac{P\times 32 g/mol}{0.0821 atm L/mol K\times 298.15 K}=0.002916 g/L$

P = 0.00223 atm

At 0.00223 atm pressure oxygen will have density twice the value.