Question

40 dm(cube) of H gass was collected over water at 831 torr pressure at 23 degree centi.What would be the volume of dru hydrogen gas at standard conditions?The vapour pressure of water at 23 degree centi. is 21 torr.

Answer 1

vol. of moist \(H_2\)=40 \(dm^3\)
P=831 Torr T=\(23degree\)\(centigrade\)
P\(H_2O\) at 23\(degree~centigrade\)=21 torr
vol. of dry \(H_2\)=?
\(\large{solution;}\)
how we can solve it by finding \(\Huge{v_1}\)=\(\Huge?\ \Huge{v_2}\)=\(\Huge?\) and others
@aaronq @thomaster have a look here please

Answer 2

So you would subtract the partial pressure of the water vapour from the total pressure to get the pressure due to \(H_{2~(g)}\) only.

From there you can use: \(\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\)

Answer 3

but how we find \(\P_1=?~P_2=?~~T_1~and~T_2=?\) please help me more

Answer 4

\(P_2\) and \(T_2\) are given in the question (i.e standard conditions)

\(P_1=P_{H_2}=P_{T}-P_{H_2O}\)

Answer 5

i am solving tring

Answer 6

degrees centigrade means degrees Celsius.

We need to convert Celsius/centigrade to Kelvin

Kelvin = degrees celsius + 273\(^oC\)

Answer 7

\(\Huge\color{purple}{Thank~You}\)
@aaronq can you please solve it more
above very useful information you tell me i mean about kelvin

Answer 8

So, 23\(^oC\) to Kelvin. 23\(^oC\) + 273\(^oC\) = 296 Kelvin

Answer 9

yes.... next .....solve it completely by understanding me...!

Answer 10

okay, so \(\sf P_1=P_{H2}=P_T-P_{H_2O}=831~ torr-21~torr=811~torr\)

\(\dfrac{811~torr*40~L}{296~K}=\dfrac{P_2V_2}{T_2}\)

Answer 11

plug in \(P_2\), \(T_2\) and solve

Answer 12

once again thankyou i solve it@aaronq

Answer 13

no problem!

Answer 14

@aaronq @aaronq @aaronq

Answer 15

how u learn chemistery tell me this trick @aaronq i learn one line 200 times but very difficulty i learn and physics as well .......can you please help me to get rid of this problem ....and give me any suggestion?

Answer 16

It's about knowing the concepts then practising them. You get better with every question you complete.

Answer 17

very easy questions like Rutherford model and others that i understan...but when i learn after few days ...it becomes out from my mind ...very easy questions out from my mind ...y its happend with me..~i don't know @aaronq

Answer 18

yeah, if you dont keep seeing it, you're very likely to forget it. Thats part of the reason why I come on this site.