Hey guys, please help me with this small doubt. How can we determine the molecular formula for compounds from the name of the compound.. i.e. we know the elements of the compound and we need to know the molecular formula for it.? I know we can know it from the valency of the compound but take this example, the molecular formula for beryllium carbide is B2C but if I consider their valencies, valency of B-2 and C-4 according to which the formula should be B4C2.
please explain.
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Answered by
2
cross valency of elements see attachment if u have any doubt ask in comment box
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nid16:
okay... but I don't get it why it's not Be4C2 according to crossing the valency. Why do we divide it?
we can divide it if it is an ionic compound
to bring the formulas into simpler forms, it is required to divide them,
thats why calcium carbonate is CaCO3 instead of Ca2(CO3)2
okay. got it
Thank you everyone :)
Answered by
2
write them as
element beryllium carbon
valency 2 4
now divide their valencies
element beryllium carbon
valency 1 2
now cross multiply the valencies
hence the formula B2C
element beryllium carbon
valency 2 4
now divide their valencies
element beryllium carbon
valency 1 2
now cross multiply the valencies
hence the formula B2C
but it is not necessary with covalent compound
like C2H6
and CBe2 is an ionic compound
yes, it is decided by IUPAC
calcium carbonate is CaCO3
oh. okay joshihimanshu46. thank you so much
my pleasure buddy
:)
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