Chemistry: Post your doubts here!

Messages
2
Reaction score
0
Points
1
Can anyone help solve this, I used Mr=MRT/PV but I couldn't get a proper value.

When an evacuated glass tube of volume 200cm^3 is filled with a gas at 300k and 101kPa the mass of the tube increases by 1.06g.

What is the identity of the gas?

A) Argon
B) Krypton
C) Neon
D) Xenon
 
Messages
21
Reaction score
2
Points
3
View attachment 65257Can anyone explain the first point , and why’s its wrong and the third one
Heyy ... I had to ask for help because I was bamboozled by the fact that 1 is not correct. Here's the deal. 1 is wrong because the equilibrium pressure will only be reached once the external pressure (atmospheric pressure) is equal to the internal pressure .Work will be done by the expanding gas until the pressures inside and out even each other . This is an application of some Isobaric Processes Theory I suggest you look that up.

Number 3 can be explained in two ways . The English there was a bit tricky for me 😂😂😂 . (1)Well the expanding gas(from dissociation products) pushes back on the plunger and hence that is the increase in the volume there
(2) There's increase in moles of gases and since moles of gases directly proportional to the volume from PV=nRT thus theres a higher volume than there would be if no dissociation occurred
 
Messages
23
Reaction score
9
Points
3
Heyy ... I had to ask for help because I was bamboozled by the fact that 1 is not correct. Here's the deal. 1 is wrong because the equilibrium pressure will only be reached once the external pressure (atmospheric pressure) is equal to the internal pressure .Work will be done by the expanding gas until the pressures inside and out even each other . This is an application of some Isobaric Processes Theory I suggest you look that up.

Number 3 can be explained in two ways . The English there was a bit tricky for me 😂😂😂 . (1)Well the expanding gas(from dissociation products) pushes back on the plunger and hence that is the increase in the volume there
(2) There's increase in moles of gases and since moles of gases directly proportional to the volume from PV=nRT thus theres a higher volume than there would be if no dissociation occurred
I’m mind blown right now😂😂 that’s such an important pointer right there
Thank you so muchhh. I tried to research about any relationship between the equilibrium pressure and atmospheric pressure , but I couldn’t .
 
Messages
23
Reaction score
9
Points
3
Hello ,
Can anyone help solve this, I used Mr=MRT/PV but I couldn't get a proper value.

When an evacuated glass tube of volume 200cm^3 is filled with a gas at 300k and 101kPa the mass of the tube increases by 1.06g.

What is the identity of the gas?

A) Argon
B) Krypton
C) Neon
D) Xenon
check your conversions of pressure and volume , because I got 130.8 as the answer which I assume is for Xenon
 
Messages
21
Reaction score
2
Points
3
I’m mind blown right now😂😂 that’s such an important pointer right there
Thank you so muchhh. I tried to research about any relationship between the equilibrium pressure and atmospheric pressure , but I couldn’t .
I’m mind blown right now😂😂 that’s such an important pointer right there
Thank you so muchhh. I tried to research about any relationship between the equilibrium pressure and atmospheric pressure , but I couldn’t .
My Pleasure 😊😊

Yeah it doesn't appear much in textbooks but here's where I trust that you will find it

Its a textbook
 
Top