Stochiometry problem

Summary:

an elementary problem with an exceptional application part.

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Stochiometry problem

Karan Singh 16 Apr 2008 07:45

A 1.000 g of Cuprous oxide ( Cu₂O ) and cupric oxide ( CuO ) is taken and is quantitatively reduced to 0.839 g of metallic copper ( Cu ). If atomic weight of Cu is 64.5 and atomic weight of O is 16 ( which is true , of course ! ), find the weight of CuO in the sample.

NOTE : the above problem has been inspired from the example 1.10 of University Chemistry, by Bruce H. Mahan.

Re: Stochiometry problem

pardesi 16 Apr 2008 09:12

i think principal of atom conservation shud solve this easily

Re: Stochiometry problem

Karan Singh 16 Apr 2008 09:45

correct abs correct

Re: Stochiometry problem

hell_ever_ 16 Apr 2008 16:29

is it approx 0.5724 g??

i solved it using simple stoichiometry relations. What is principle of atom conservation?

Re: Stochiometry problem

madnessweasley 16 Apr 2008 16:31

refer R C Mukherjee if you have it :)

PS : Its actually easy but im too lazy 2 type :D

Re: Stochiometry problem

hell_ever_ 16 Apr 2008 16:38

i dont have it…..
so can u plz….?

Re: Stochiometry problem

pardesi 16 Apr 2008 16:44

get that book da it's damn essential

Re: Stochiometry problem

madnessweasley 16 Apr 2008 16:47

The principle of conservation os mass, expressed in the concepts of atomic theory, means the conservation of atoms. And if atoms are conserved, moles of atoms shall also be conserved. This is known as the principle of atom conservation

That was from RCM :)

Example

(1)

\begin{align} AB + CD \rightarrow AD + BC \end{align}

in this eqn, the no. of moles of A shd be same in the LHS and the RHS
therefore moles of A in AB = moles of A in AD

(2)

\begin{align} \implies \frac {\text{wt of AB in grams}}{\text{mwt of AB}} = \frac {\text{wt of AD in grams}}{\text{mwt of AD}} \end{align}

Re: Stochiometry problem

madnessweasley 16 Apr 2008 16:48

par, its not damn essential but i agree its useful

PS : An excellent teacher is always sufficient for this pattern :D

Re: Stochiometry problem

hell_ever_ 16 Apr 2008 16:49

i use p.bahadur…
that aint enough??

ive heard my friends say (who have started inorganic) that there is no fixed process (like organic reactions)
in inorganic chemistry.
Is there any choice other than learning by rote??
my friends use jd.lee

and im too lazy to by-heart any chemistry.

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