Homework Help

How do I calculate the density of gaseous O2 under STP?

user profile pic

quietbang | Student, College Freshman | eNoter

Posted September 20, 2012 at 4:25 PM via web

dislike 1 like

How do I calculate the density of gaseous O2 under STP?

3 Answers | Add Yours

user profile pic

sciencesolve | Teacher | (Level 3) Educator Emeritus

Posted September 20, 2012 at 4:48 PM (Answer #1)

dislike 1 like

You should remember the formula that relates density, mass and volume such that:

`rho = m/V`

`rho`  represents the density

m represents the mass

V represents the volume

Since the problem requests to evaluate the density of gaseous `O_2` , you should remember that the volume of a mole of an ideal gas at standard temperature and pressure is of 22.4 L.

You need to evaluate the molar mass of `O_2`  such that:

`m= 2*16 = 32 g`

Substituting 32g for m and 22.4 for V yields:

`rho = 32/22.4 = 1.428 g/L`

Hence, evaluating the density of gaseous `O_2`  at standard temperature and pressure yields `rho = 1.428 g/L` .

Sources:

user profile pic

niteshtanwar | Student, Undergraduate | eNoter

Posted September 21, 2012 at 7:07 AM (Answer #2)

dislike 0 like

p=m/v

p represents the density

m represents the mass

V represents the volume

1.428g/l

user profile pic

sarahokoth | Student, Grade 9 | Honors

Posted September 21, 2012 at 8:05 AM (Answer #3)

dislike 0 like

at stp volume is 22.4dm3 hence:

d=m/v

mass=16x2

mass=32;

d=32/22.4

ans=1.42g/dm3

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes