Qualification > Sciences

Moles Problem!

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Saladin:
Hey, I really dont get this. The question is here.

This is how I did it:

(c)(i)



(ii)

As the ratio of I2 and CH3CH2I is 1:1.

Therefore, it should be something like this:



But this is not the answer. I really not understand how this all works!

nid404:
2P + 3I2 ? 2PI3
3CH3CH2OH + PI3 ? 3CH3CH2I + H3PO3

Look carefully at the ratio

1:1?

1:2 :) 

Saladin:

--- Quote from: nid404 on May 10, 2010, 09:23:50 am ---2P + 3I2 ? 2PI3
3CH3CH2OH + PI3 ? 3CH3CH2I + H3PO3

Look carefully at the ratio

1:1?

1:2 :) 



--- End quote ---

Thats what I dont get, how is it 1:2?

Meticulous:
Exactly..look carefully at the ratios

2PI3 ----> I2

PI3 ---> 3CH3CH2I

first find the moles of PI3 : 0.0788* 2/3 =0.05253

now find iodoethane mole: 3* 0.05253= 0.1576

therefore, mass= 0.1576* 156= 24.6 g

princess12:
that is the thing i donot get it also how the ratio come always

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