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#### benworld

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« Reply #15 on: February 16, 2010, 01:32:00 PM »
thats is what i did

g to mol  and mol to g

#### maximus242

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« Reply #16 on: February 16, 2010, 01:39:47 PM »
Yea so just calculate it and there you go

« Last Edit: February 16, 2010, 01:52:24 PM by maximus242 »

#### benworld

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« Reply #17 on: February 16, 2010, 01:42:56 PM »
Nacl is inert elements, it has no effect at all.

1. Found Mol of Bacl2 * 2H20

2. Take the mol and times it by mole of H20 Since it H20 is being decomposed.

3. Take Mole of H20 and convert new substance into grams

4. Take the answer and minus it by original mass

It seems pretty simple as that ?

#### maximus242

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« Reply #18 on: February 16, 2010, 01:51:54 PM »
Yea if you take the H20 weight and minus it from the original mixtures weight that will give you the weight of NaCl and BaCl2.

#### benworld

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« Reply #19 on: February 16, 2010, 01:58:17 PM »
Sounds..good..lol finally

36.00 g 2H20
------------  x 100 = 14% is how much dam 2H20 is
244.20

4.165 * 0.55 = 2.29075 g

2.29075 * 0.14 = 0.320705 g (2H20)

4.165 - 0.320705 = 3.844 g solid residu left ( bam...tell me if this is the answer )

#### maximus242

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« Reply #20 on: February 16, 2010, 02:10:38 PM »
Ah you cant do this 4.165 * 0.55 = 2.29075 g

Its 55% by mole not by weight right? So you have to figure out what the moles are, then calculate the percentage of weight of BaCl2*2H2O, then convert it back to grams, then calculate weight of 2H2O.

You know there should be formulas for this in your textbook..

#### benworld

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« Reply #21 on: February 16, 2010, 02:16:01 PM »
no its by weight...It says BaCl2 * 2H20 is 55 % ... So its assume its weight... aka....saying if entire sample is 4.156 g , then 55% of mixture 4.165 is 2.29075 in grams ?

Am I making sense.

#### maximus242

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« Reply #22 on: February 16, 2010, 02:40:20 PM »
Oh lol ffs then it's rediculously easy. The other guy said it was by moles. Then yea you got it right as.

#### DrCMS

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« Reply #23 on: February 16, 2010, 02:52:18 PM »
Oh lol ffs then it's rediculously easy. The other guy said it was by moles. Then yea you got it right as.

Yeh but you still managed to make it more complicated by steering him in the wrong directions with your stupid answers for molecular weights.  Also nobody but you said it was 45:55 in mole ratio, sjb simply pointed out benworld was wrong to use 1:1 mole or mass ratio.  In future either make sure you are right or shut up.

#### maximus242

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« Reply #24 on: February 16, 2010, 06:17:36 PM »
He ended up with the right answer didnt he? I misunderstood something, I apologize for being a fallible, imperfect human being.

Theres no need to be rude.
« Last Edit: February 16, 2010, 06:35:58 PM by maximus242 »

#### DrCMS

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