toxicsugar22
For the following reaction, 6.73 grams of hydrochloric acid are mixed with excess barium hydroxide. The reaction yields 15.5 grams of barium chloride.
2 HCl (aq) + Ba(OH)2 (aq) = BaCl2 (aq) + 2 H2O (l)
(1) What is the theoretical yield of barium chloride ?
grams
(2) What is the percent yield for this reaction ?
%
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electrokid
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step 1.
2 moles HCL -----> 1 mole BeCl2
step 2.
find gram molecular wts of HCl and BeCl2
electrokid
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@toxicsugar22 now, express the answer
toxicsugar22
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thsi is my first time doing this so please bear with me
toxicsugar22
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im just practicing
electrokid
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no problem.. try it. it is fairly easy,...
electrokid
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just answer for step 2.
electrokid
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gram mol weight (gmw) = sum of atmic weights of all the elemnts in the molecule
so, gmw of HCl = at. wt. of H + atomic wt. of CL
electrokid
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at. wt. of Cl = ? you have to refer to your Preiodic table
electrokid
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17 is the "atomic number" of Cl
and
35.5 is the atomic wt.
toxicsugar22
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1+35
electrokid
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good,
so, gmw of HCl = 36.5
what this means is that
1mole of HCl weighs 36.5g (g=grams)
electrokid
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similarly, for BeCl2... notice that there are two atoms of chlorine
electrokid
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sorry it is BaCl2
electrokid
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practice to write it clearly..
gmw of BaCl2 = ___ + ___ + ____ = ____g
toxicsugar22
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sorry I got 137 is the atomic number for Ba and 35 for Cl
electrokid
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no..
atomic number = number of protons in the nucleus of an atom
atomic mass number = total number of protons + neutrons in the nucleus of an atom
electrokid
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ok
so gmw of BaCl2 = ?
toxicsugar22
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I added the two 137+ 35
electrokid
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good
now back to step 2...
summarize our values
electrokid
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@toxicsugar22
electrokid
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you see.. those are just numbers.. I cannot help you unless you put meaning to them.
gram mol wt of HCL =
gram mol wt of BaCl2 =
toxicsugar22
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1mole of HCl weighs 36.5g
1 mole of BaCI2 WEIGHS 172
electrokid
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good.
electrokid
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now, using step 1,
2 moles of HCl ----------- yield ----------> 1mole BaCl2
i.e,
2* gmw of HCL ------------ yields -----------> 1*gmw of BaCl2
electrokid
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follow?
electrokid
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now, put your numbers
electrokid
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2*_ = __ g of HCl ---- > ____g BaCl2
electrokid
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perfecto..
toxicsugar22
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02*36.5 = 73 g of HCl ---- > 172g BaCl2
electrokid
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so,
73g HCl ------> 172g BaCl2 (Theoretical)
so,
6.73g HCl -------- should yield how much? (we have 6.73g HCl and Expected BaCl2 is?)
electrokid
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no.. HCl is our "reactant"..... BaCl2 is our product
electrokid
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no
electrokid
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ok,
so, 73g HCl ----------- reacts to give us (yield) --------> 173g of BaCl2
how much HCl do we have in our reaction? (this part from the given question)
toxicsugar22
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15.5 is the actual yield
electrokid
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just stay to the point... do not go jumping places.
toxicsugar22
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6.73 is how much HCI WE HAVE
electrokid
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good.
electrokid
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so,
if
73g HCl -------- provides -------> 173g BaCl2
then
6.73g HCl --------- should provide -----> ____g of BaCl2
this is a simple ratio..
electrokid
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follow?
electrokid
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STEPS!!!
electrokid
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..... \[{6.73 \times 173 \over 73}=?\]
toxicsugar22
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15.94
electrokid
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ok. but do you understand this?
toxicsugar22
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OK NOW i DO
toxicsugar22
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I had to rethimk the problem
electrokid
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good.
then
THIS is your theoretical yield
i.e.,
in theory, that 6.73g of HCl should give us with 15.94g of BaCl2
electrokid
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got it?
toxicsugar22
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good thank you for tutoring me
electrokid
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not done yet
that is just part (a)
toxicsugar22
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part B. is where we do actual yield times theroicatl yield / 100
toxicsugar22
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is that right
electrokid
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(b)
% yield = (actual yield) * 100 / (theoretical yield)
this value must be less than 100
actual yield = given in problem
theoretical yield = calculated above
toxicsugar22
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ok
toxicsugar22
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so 15.5 times 100/ 15.94 =97.23
electrokid
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yes
toxicsugar22
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ok good
toxicsugar22
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can you go over one more problem with me
toxicsugar22
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you are good tutor for me
toxicsugar22
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just so I get this done evenfurthur
electrokid
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call it a day for today. some other time.
keep practicing, put meanings to numbers and write clearly so you see what you are doing
toxicsugar22
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ok thank you for helping me
electrokid
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@toxicsugar22 wtf not even a medal for the pain
toxicsugar22
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soory I forgot