Qualification > Sciences
Chemistry Help HERE ONLY !!
Ghost Of Highbury:
hey shogun chk out d "a request" thread..
i have explained abt the binomial theorm in math..!!
Shogun:
alright
Pythagoras:
The syllabus is really helpful. It clearly indicates what to study. The syllabus is guiding my studies! :D
Bani:
--- Quote from: Roza on May 25, 2009, 10:12:06 am ---
--- Quote from: ManaH on May 25, 2009, 10:05:09 am ---
--- Quote from: Roza on May 25, 2009, 10:01:21 am ---
--- Quote from: ManaH on May 25, 2009, 08:39:12 am ---I need help in chemistry oct/nov 08 second varient paper
Q 7ai)
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i actually got this question for my mocks
here's the working
volume of oxygen left
according to question according to equation
1 mol 6.5 mol
if 20cm3 x??
so 20 x 6.5 = 130cm3
150-130 = 20cm3
so volume of oxygen left = 20cm3
volume of carbondioxide formed
1 4
20 x??
so 20 x 4 = 80
volume of carbondioxide formed = 80cm3
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Thankyou but wont we use the formulaa???
n umm why did u subtracted it form 150?
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no there is no need to use a formulae
n oxygen is in excess n we want to find the volume of oxygen left at the end of experiment
so 150-130= 20
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Hey, correct me someone if Im wrong. For part i) don't we simply write down the volume of the reagent which is not in access? So, there is no need to subtract or is there?
godfather93:
can someone please tell me the concept of oxidation states and how is it worked out?
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