IIT JEE , AIEEE Forum - Chemistry , Physical Chemistry

dkpoet

While teaching the first chapter of chemistry, in stoichiometry, our school teacher taught us a new concept termed, POAc.

It means Principle of Atom Conservation. It is applied like this,

N + H2 ----> NH3

number of moles of N = number of moles of NH3

=> 1 * N = 1 *NH3

or

number of moles of H= number of moles of NH3

=> 2* H = 3 * H

Now, please tell me if this formula is working and also if it is applicable in stoichiometry. Also give me more infro abt it and about's it application on limiting reagents too.

Thank You.

sid_2222000

ur approach is wrong dude..........the poac states tht the no of atoms shuld be same on both sides(of each specie and also total) , thts y the question of balancin comes up...........
for eg. N2 + 3h2------>> 2nh3 gives the complete eq. ......here the total no of atoms are same on both sides .......of each specie ie.nitrogen,hydrogen.......do rate if u r satisfied wid the ans.......

sid_2222000

whole stoichiometry is based on poac dude ..........now a re4action will only take place if all the reqd no of atoms of each type are available..........i mean if in case of ammonia formation only 1/2 moles of nitrogen and 3 moles of hydrogen are given then only 1.5 moles of hydrogen will react wid 0.5 moles of nitrogen to give 1 mole of ammonia............

arun-rashi

this is principle of atomoic conservation.yhis is similer to conservation of moles or conservation of miliequivalents.for example following reaction takes place CaOCl2 +H2O gives Cl2 this reacts with KI to librate I2 which reacts with known millieq. of Na2S2O3 so we can say that meq of hypo is equal to any thing in between means equal to chlorine or iodine so we calculate wt of unknown species.second thing you ask is limiting fector for example 5 millieq. of NaOH reacts with 10 millieq of HCl so NaOH is limiting reagent because it limit the reaction because less in amount.

arun-rashi

for detail study of POAC you consult R.C MUKERJE FOR MORE example.

anjansarkar.1

1st of all... da reaction is:
N2 + 3H2 ------> 2NH3

POAC so works...
no.of atoms of N in reac. = no.of atoms of N in product = 2
and
no.of atoms of H in reac. = no.of atoms of H in product = 6

n our expert is right!! refer to RC Mukherjee 4 more details...

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