Question

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 ?

%

Answer 1

step 1.
2 moles HCL -----> 1 mole BeCl2

step 2.
find gram molecular wts of HCl and BeCl2

Answer 2

@toxicsugar22 now, express the answer

Answer 3

thsi is my first time doing this so please bear with me

Answer 4

im just practicing

Answer 5

no problem.. try it. it is fairly easy,...

Answer 6

just answer for step 2.

Answer 7

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

Answer 8

at. wt. of Cl = ? you have to refer to your Preiodic table

Answer 9

17 is the "atomic number" of Cl
and
35.5 is the atomic wt.

Answer 10

1+35

Answer 11

good,
so, gmw of HCl = 36.5

what this means is that
1mole of HCl weighs 36.5g (g=grams)

Answer 12

similarly, for BeCl2... notice that there are two atoms of chlorine

Answer 13

sorry it is BaCl2

Answer 14

practice to write it clearly..
gmw of BaCl2 = ___ + ___ + ____ = ____g

Answer 15

sorry I got 137 is the atomic number for Ba and 35 for Cl

Answer 16

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

Answer 17

ok
so gmw of BaCl2 = ?

Answer 18

I added the two 137+ 35

Answer 19

good
now back to step 2...
summarize our values

Answer 20

@toxicsugar22

Answer 21

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 =

Answer 22

1mole of HCl weighs 36.5g
1 mole of BaCI2 WEIGHS 172

Answer 23

good.

Answer 24

now, using step 1,
2 moles of HCl ----------- yield ----------> 1mole BaCl2
i.e,
2* gmw of HCL ------------ yields -----------> 1*gmw of BaCl2

Answer 25

follow?

Answer 26

now, put your numbers

Answer 27

2*_ = __ g of HCl ---- > ____g BaCl2

Answer 28

perfecto..

Answer 29

02*36.5 = 73 g of HCl ---- > 172g BaCl2

Answer 30

so,
73g HCl ------> 172g BaCl2 (Theoretical)
so,
6.73g HCl -------- should yield how much? (we have 6.73g HCl and Expected BaCl2 is?)

Answer 31

no.. HCl is our "reactant"..... BaCl2 is our product

Answer 32

no

Answer 33

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)

Answer 34

15.5 is the actual yield

Answer 35

just stay to the point... do not go jumping places.

Answer 36

6.73 is how much HCI WE HAVE

Answer 37

good.

Answer 38

so,

if
73g HCl -------- provides -------> 173g BaCl2
then
6.73g HCl --------- should provide -----> ____g of BaCl2

this is a simple ratio..

Answer 39

follow?

Answer 40

STEPS!!!

Answer 41

..... \[{6.73 \times 173 \over 73}=?\]

Answer 42

15.94

Answer 43

ok. but do you understand this?

Answer 44

OK NOW i DO

Answer 45

I had to rethimk the problem

Answer 46

good.
then
THIS is your theoretical yield
i.e.,
in theory, that 6.73g of HCl should give us with 15.94g of BaCl2

Answer 47

got it?

Answer 48

good thank you for tutoring me

Answer 49

not done yet
that is just part (a)

Answer 50

part B. is where we do actual yield times theroicatl yield / 100

Answer 51

is that right

Answer 52

(b)
% yield = (actual yield) * 100 / (theoretical yield)
this value must be less than 100

actual yield = given in problem
theoretical yield = calculated above

Answer 53

ok

Answer 54

so 15.5 times 100/ 15.94 =97.23

Answer 55

yes

Answer 56

ok good

Answer 57

can you go over one more problem with me

Answer 58

you are good tutor for me

Answer 59

just so I get this done evenfurthur

Answer 60

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

Answer 61

ok thank you for helping me

Answer 62

@toxicsugar22 wtf not even a medal for the pain

Answer 63

soory I forgot