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what is the percentage of oxygen in air? 20% the question states that ALL the oxygen is used up..which means that 20% of the air is used AND that is equicalent to 30cm3 (as it says the volume of air is decreased by 30) % of air = 100 % of Oxygen = 20 Volume of air = ...

umm...not yet working...temme the question number, and subject..i mean bio or chem?

Assalam-o-alaikum wr wb.. try uploading the file again..it isn't opening!

Walaikumassalam wr wb... Jazakallah Khair and Aameen!

Walaikumassalam wr wb... سبحان الله والحمد لله ولا اله الا الله والله اكبر سبحان الله وبحمده سبحان الله العظيم

Assalam-o-alaikum wr wb... well if oxyger, OH- is produced, it means that chlorine remain as the solution...i.e the solution is Sodium Chloride NOT Sodium Hydroxide.. actually....the theory behind this question (as others say) is that...once the OH- ions are discharged...the solution, sodium...

hmm okie...Jazakallah Khair both of you.. May Allah make the papers ez for you and may He give you success in this world as well as the Hereafter...Aameen!

aoa wr wb.. your statuses/mood and username contradicts...cheer up gurl!!! =P

umm...okie i get you..but why are we supposed to see/wait till all the OH- ions are over? :confused:

what do you mean?

in aqueous solutions...the one lower in the series is discharged, in this case OH- ions... the thing you are saying is when the solution is concentrated but in the question, no where it is mentioned that it is concentrated which means it is dilute :confused:

Assalam-o-alaikum wr wb... can someone please tell me the answer to this question! Jazakallah Khair...

Walaikumassalam wr wb... سبحان الله والحمد لله ولا اله الا الله والله اكبر سبحان الله وبحمده سبحان الله العظيم

Walaikumassalam wr wb :)

Assalam-o-alaikum wr wb... سبحان الله والحمد لله ولا اله الا الله والله اكبر سبحان الله وبحمده سبحان الله العظيم

As far as i am concerned about, annoying doesn't help you relax :P

Assalam-o-alaikum wr wb.. keep waiting :P multixamza01 please atleast let the exams get over...otherwise trust me i will go and beg every moderator and admin to lock this thread :LOL: :ROFL: (and for that i am sure imma get LOADS of duas/prayers Inshallah :P)

LOL she never mentioned the subject so i was checking bio :oops: :P