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Physical Chemistry

Cool goIITian

Joined:	10 Feb 2008
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20 Mar 2008 02:37:01 IST

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573

Stoichiometry

None

pls help me out with these 4 questions.

1. A natural gas sample contains 84%(by volume) of CH4, 10% of C2H6, 3% of C3H8 & 3% of N2. if a series of catalytic reactions cud be used for converting all the C atoms of the gas into butadiene, C4H6, with 100% efficiency, how much butadiene cud be prepared from 100 g of the natural gas?

2. What weights of P4O6 & P4O10 will be produced by the combustion of 2g of P4 in 2g of O2 leaving no P4 & O2?

3. From the following reactions calculate how much F2 will be consumed to produce 1kg of (CF2)n.

2CoF2 + F2 -> 2CoF3

(CH2)n + 4nCoF3 -> (CF2)n + 2nHF + 4nCoF2

4. 1 litre of an acidified sol of KMnO4 containing 15.8g of KMnO4 is decolourised by passing sufficient amt of SO2. if SO2 is produced by roasting of FeS2, what will be the amt of FeS2 required to produce the necessary amt of SO2?

pls answer these using POAC. thanx in advance cos i hv to go now.

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Comments (7)

BALGANESH

Blazing goIITian

Joined: 14 Nov 2007

Posts: 309

20 Mar 2008 10:10:20 IST

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50.n g of CF2 requires = 115 .4n g of CoF3 requires

therefore 1000g 0f CF2 requires =9200g of CoF3

NOW 2. 115 g of Cof3 requires 38 of F2

therefroe 9200g of CoF3 requires 38.9200/2. 115 =1520g

note molecular weigt of Cof3 = 115g and THAT of F2 = 38g

BALGANESH

Blazing goIITian

Joined: 14 Nov 2007

Posts: 309

20 Mar 2008 11:26:50 IST

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volume moles ( weight of the given compound)

therefore 84 % of CH4 = 84 of CH4

now consider the reaction

4CH4 - 5H2 = C2H6

here 4.16 g of CH4 gives 54 g of C2H6

threfore 84 g of CH4 = 70.875

similarly for the other compound

10 g OF C2H6 = 9 g of C2H6

3 gof C3H8 = 2.76 g OF C2H6

adding these we egt the total mass of the required copmpound =82.635 g

BALGANESH

Blazing goIITian

Joined: 14 Nov 2007

Posts: 309

20 Mar 2008 11:47:47 IST

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Anish Sinha

Cool goIITian

Joined: 10 Feb 2008

Posts: 57

21 Mar 2008 01:04:16 IST

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hey i still havent got the answers. only the 1st & 3rd one was right that too slightly wrong. i'm posting answers answers to all questions so that u can match them with yours.

1. 82g

2. 1.996g , 2.004g

3. 1.52kg

4. 15g

quick guys. pls do this.

Anish Sinha

Cool goIITian

Joined: 10 Feb 2008

Posts: 57

21 Mar 2008 01:26:45 IST

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pls help anyone. reply.

BALGANESH

Blazing goIITian

Joined: 14 Nov 2007

Posts: 309

21 Mar 2008 01:32:50 IST

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according to the reaction

2KMnO4 + H2SO4 +5SO2 = K2SO4 + MnSO4 + 5S03

(BALANCE ONLY THE REQUIRED PART)

2 . 158 g of KMnO4 = 320 g og S02

therefore 15.8 g of KMnO4 = 16 g of S02

now see the reaction

4Fes2 + 5o2 = 8SO2 + 2FeO3

from the reaction

512 g of SO2 = 480 g of FeS2

therefore 16 g of SO2 = 15 g of FeS2

rate if correct or useful

BALGANESH

Blazing goIITian

Joined: 14 Nov 2007

Posts: 309

21 Mar 2008 01:40:46 IST

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i think i should go for eye check up

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