Monday, June 29, 2020
Sunday, June 28, 2020
Vapour density of mixture of NO2 and N2O4 is 34.4 , then percentage abundance (by volume) of NO2 in mixture is .
Molecular weight = 2×VD
= 2× 34.5 = 69 u
Consider ℅ of NO2 is "x" then % of N2O4 is "100-x"
Saturday, June 27, 2020
What are the structure of CO2 , NO2+ , OCN- , SCN- ?
These molecules are isoelectronic so structure are also similar :
Why does CO form a coordinate bond?
In carbon monoxide molecule carbon and oxygen form a double bond by sharing of two bond pairs , in which
carbon as well oxygen contributes 2 electrons to each other to form a double bond .
Now octet of oxygen is completed but carbon is left with two (2) valence electrons and it has a total of six electrons so it's octet is incompleted.
Hence carbon is relatively unstable than oxygen atom because oxygen has nearest noble gas configuration of 8 electrons in their valence shell.
So in order to attain stability oxygen contributes one of its lone pair of electrons to the carbon atom in the formation of a coordinate bond . This leads to completion of octet of both carbon and oxygen .
Important note:
In coordinate bond a pair of electrons is shared between two atoms but it is contributed by a single atom( Here contributor of lone pair is oxygen atom).
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