Biology; Chemistry; Physics: Post your doubts here!

[SalmanPakRocks]

got it thanks salman nad mayedah

No problem.

 

[AnGeL.Of.DaRkNeSs]

I don't think that's possible becuase, that would be the mass of Octane and to calculate the mass of Carbon dioxide, shouldn't we use the mole ratio?

we dont even need OCTANE in this question yar.
salman we only need co2 emitted... it says for 1km 108g co2 is formed so for 100 km ofcourse 10800g co2 will be formed or emitted

 

[SalmanPakRocks]

salman we only need co2 emitted it says for 1km 108g co2 is formed so for 100 km ofcourse 10800g co2 will be formed or emitted

but H2O is also formed as a product right? The amount should therefore be shared between the two?

 

[AnGeL.Of.DaRkNeSs]

but H2O is also formed as a product right? The amount should therefore be shared between the two?

that is something that isnt mentioned in the question we cant assume things unless its stated its only stated for 1 km this formed so for 100 x forms....use cross multiplication all other aspects i dont think we need to consider and I GUESS that 1km for which it says 108 g maybe its the final carbon mass after sharing for 1 km then what us nazr se dekho question ko

 

[SalmanPakRocks]

that is something that isnt mentioned in the question we cant assume things unless its stated its only stated for 1 km this formed so for 100 x forms....use cross multiplication all other aspects i dont think we need to consider and I GUESS that 1km for which it says 108 g maybe its the final carbon mass after sharing for 1 km then what us nazr se dekho question ko

Ahan but bro see the equation
2C8H18 + 25O2 = 16CO2 + 18H2O
so this H2O is basically the product of Octane right because when Alkanes undergo combustion they form, CO2 and H2O.
So we can't say that all the Octane that is used up would make CO2, some might also make H2O right?

 

[AnGeL.Of.DaRkNeSs]

then the question says for 1 km 108g co2 is formed who knows that this 108 is final co2 formed along with h20??

 

[SalmanPakRocks]

then the question says for 1 km 108g co2 is formed who knows that this 108 is final co2 formed along with h20??

SORRY! I mis-understood the question! Sorry and Thanks :*

 

[AnGeL.Of.DaRkNeSs]

welcome :*

 

[Executor]

Ok i dont mean to do spam or anything but please go to the following thread and make dua for all of us :
http://www.xtremepapers.com/community/threads/dua-for-all-candidates.14272/

Dont forget to share and Remember every share makes a difference

 

[SalmanPakRocks]

Ok i dont mean to do spam or anything but please go to the following thread and make dua for all of us :
http://www.xtremepapers.com/community/threads/dua-for-all-candidates.14272/

Dont forget to share and Remember every share makes a difference

JazakAllah for sharing

 

[shahzeb125]

pleeeease someone help .... which book is best for physics last few chapters... practical electricity to radioactivity! really worried

Stephen Pople is a nice and detailed book

 

[Spidey21]

All those who were worried why it was Cl- ion which was being discharged...i got this from the Xtreme Revision...

"Oxygen from OH- from water is always discharged at the anode except in one case, this is if the other negative ion is a halide"

 

[amna shah]

What is the relationship of VOLTAGE with RESISTANCE ?? and how would a RESISTANCE/CURRENT graph look like ??

 

[Spidey21]

What is the relationship of VOLTAGE with RESISTANCE ?? and how would a RESISTANCE/CURRENT graph look like ??

voltage and resistance are inversely proportional if you keep the current constant as u can see from V=IR

and as R and I are inversely propotional then you can see that the graph would be like this

 

[Spidey21]

and i found this table and found it real handy...hope it helps...

 

[bogus]

voltage and resistance are directly proportional @spidey

 

[bogus]

All those who were worried why it was Cl- ion which was being discharged...i got this from the Xtreme Revision...

"Oxygen from OH- from water is always discharged at the anode except in one case, this is if the other negative ion is a halide"

not true... o2 is liberated if the other negative ion is not concentrated

 

[ayeshaK]

What is the relationship of VOLTAGE with RESISTANCE ?? and how would a RESISTANCE/CURRENT graph look like ??

voltage and resistance are inversely proportional if you keep the current constant as u can see from V=IR

and as R and I are inversely propotional then you can see that the graph would be like thisView attachment 8540

According to Ohm's law i.e. E=IR. When we increase resistance, keeping current constant, voltage will increase as in the above formula since E and R are directly proportional.
U got the graph right but voltage and resistance are directly propotional !!

 

[Mayedah]

Please check again

Yes its right now !

 

[AnGeL.Of.DaRkNeSs]

i was wondering well here is a circuit with a battery that supplies 6 volts if we put either 20 ohm resister or 30 whatever the amount is the battery still supplies 6 volts it isnt like that if we put 10 ohm resister the voltage gets higher value than 6 battery is still supllying a constant 6 volts regardless of the resistance offered by the resister.....so how is voltage directly proportional to resistance??? i may be wrong