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3 Mar 2008 20:34:47 IST

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PHYSICAL DOUBT

None

64g of a organic compound has 24g of C and rest hydrogen & oxygen
find d empirical formula ????????????/

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ashwin menon

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3 Mar 2008 20:38:10 IST

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CH3CHO

ANUBHAV SURI

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3 Mar 2008 21:22:55 IST

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buddy your answer is wrong

LAMPARD

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3 Mar 2008 21:24:06 IST

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Is it C₆₄H₃₂₁O₈?If yes,den i'll post soln..

ANUBHAV SURI

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3 Mar 2008 21:25:25 IST

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sorry dude u too r wrong

ERAGON007

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3 Mar 2008 21:31:39 IST

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is it C₆H₁₂O₇

dev_22oct

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3 Mar 2008 21:35:24 IST

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ans is CH₄O

ANUBHAV SURI

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3 Mar 2008 21:35:48 IST

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let me give d choices

C2H8O2
CH4O
C2H4O
CH2O

whatever b ur ans. plz. give d explaination whether not in d choices

dev_22oct

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3 Mar 2008 21:37:00 IST

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bt dude your question is not complete its 24g carbon and 8g hyrogen and rest is carbon.....js check it again...i think u have taken it from op aggarwal.

ANUBHAV SURI

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3 Mar 2008 21:37:15 IST

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yes dev. plz gimme d explaination

ANUBHAV SURI

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3 Mar 2008 21:38:39 IST

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i had found it in an online test @engineerprep

iberis

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3 Mar 2008 21:47:51 IST

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it'll be CH₄O.

you have 24g Carbon in 64g of the compound ie. 2-C. n rest is O and H. O will be minimum 16g. remaining will be H (64-24-16= 20). 20 H with 2C is not possible. so there has to be one more O. thus remaining H will be 64-24-32=8.

thus it'll be C₂H₈0. n the empirical formula will be CH₄O.

LAMPARD

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3 Mar 2008 21:48:53 IST

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Element    %       At.Wt         Rel. no. of atom        Simplest ratio
C         37.5        12              37.5/12=3.125         3.125/3.125=1

H         12.5         1                12.5/1=12.5            12.5/3.125=4

O          50           16              50/16=3.125            3.125/3.125=1

Thus,emperical formula =CH₄O
Hope u got it...
sry fr de wierd ans. above...

ANUBHAV SURI

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3 Mar 2008 21:57:01 IST

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yar i m confused to how v can take d mass of oxygen to b 16g

LAMPARD

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3 Mar 2008 21:58:13 IST

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wats confusing in dat?mass of O is 16...mass of O2 is 32....

ANUBHAV SURI

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3 Mar 2008 21:59:47 IST

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it is not given dat mass of oxygen present is 16g

ashwin menon

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3 Mar 2008 22:01:40 IST

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ooopps!!...sorry .made a small mistake..
and ya..mass of oxygen is taken a s16..

ANUBHAV SURI

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3 Mar 2008 22:09:35 IST

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u r not understandin my problem dat v will take mass of O2
to b 16g only if it is given dat d percentage of o2 is 25% or
50%.but here it is not given

iberis

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3 Mar 2008 22:25:33 IST

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See, consider a compound containing C,H,O with molecular wt. 64. if the weight of C in it is 24, then we can say 2-C are present. n rest 40g is O and H. If 1-O is present weight of H remaining will be 24. which is not possible for a compound containing 2C. so we include 2O. thus remaining H will be 40-32=8.

its formula will be C₂H₈O₂ n simplest will be CH₄O.

ashwin menon

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3 Mar 2008 22:30:28 IST

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@effort..we r not taking O2 as a GAS here.. here its just an oxygen atom.. so it cant have much deviation frm it weight of 16...

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