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CHEM AND BIO HELP AND TIPS HERE

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The InViSiBlE GIrl (Eva):

--- Quote from: CatAly$t on June 05, 2010, 08:13:46 pm ---somebody pls explain to me this...

--- End quote ---
Hey Ya could someone pls do this question its really wierd cant figure it out at all

$H00t!N& $t@r:

--- Quote from: Dizzy on June 06, 2010, 09:20:41 pm ---Hey Ya could someone pls do this question its really wierd cant figure it out at all


--- End quote ---
lol wheres the question?

The InViSiBlE GIrl (Eva):
Hey smart guy can u pls solve this question for me really cant understand it The link is just below this line.
Quote from: CatAly$t on June 05, 2010, 07:13:46 PM

--- Quote from: ~VIN1094~ on June 06, 2010, 08:47:59 pm ---
c)

1. 12.16/152 g= 0.08 moles

2. Molar ratio
= 2 : 1
= 0.08 : x
so x= 0.04

3. 56+56+16+16+16 = 160g

4.  moles = mass/mass of 1 mole

mass = 0.04 * 160
=6.4g

5. two gases so 0.04 + 0.04 = 0.08mol

6. vol of gas = 0.08 * 24
= 1.92

--- End quote ---

The InViSiBlE GIrl (Eva):
Hey smart guy can u pls solve this question for me really cant understand it The link is just below this line.
Quote from: CatAly$t on June 05, 2010, 07:13:46 PM

--- Quote from: ~VIN1094~ on June 06, 2010, 08:47:59 pm ---
c)

1. 12.16/152 g= 0.08 moles

2. Molar ratio
= 2 : 1
= 0.08 : x
so x= 0.04

3. 56+56+16+16+16 = 160g

4.  moles = mass/mass of 1 mole

mass = 0.04 * 160
=6.4g

5. two gases so 0.04 + 0.04 = 0.08mol

6. vol of gas = 0.08 * 24
= 1.92

--- End quote ---

Vin:

--- Quote from: Shooting Star on June 06, 2010, 09:15:39 pm ---ok i have a silly question...  :-[      s05 q2c (i)  
how do u knw which one is in excess?

--- End quote ---

OK look at the graph, mass of the plate is constant after some time. What does it mean? No more Zn is reacting, right? So the reaction is finished. Therefore Zn is excess as it is still left after the reaction is over. Got it?

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