Nikhil619
An alloy has Fe, Co , Mo in a composition of 71%, 12%, 17% respectively. How many cobalt atoms are there in a cylinder of radius 2.5 cm and length 10 cm .The density of the alloy is 8.2 g/ml.[At.wt Co=59]
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shubhamsrg
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mass= density * volume
density is given
volume = pi r^2 h
fine mass
12% of mass is the final answer
use appropriate units.
shubhamsrg
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find*
Nikhil619
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oh.. we should take v of cylinder as volume?
shubhamsrg
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yep
Nikhil619
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and they've asked number of cobalt atoms..how is that 12% of mass?
shubhamsrg
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ahh okay
12% of that = mass of cobalt
atoms in 1 mole of cobalt = avagadros no.
atoms in given mass = ?
Nikhil619
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12 % of that? what is that? no.of atoms? or no.of moles?
Peter14
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looks like 12% by mass
shubhamsrg
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12% of that , that'll give mass of cobalt in the compound
Nikhil619
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what is 'that'?
Peter14
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"that" is the mass of the cylinder I think
shubhamsrg
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that is mass of the compound in the given volume -_-
Nikhil619
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ok so mass of the alloy..right?
shubhamsrg
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yo B|
Nikhil619
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look..im sorry if u feel im dumb..but hw am i supposed 2 find mass of alloy?
shubhamsrg
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mass = density * volume -_-
Nikhil619
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Volume? again volume of cylinder?
Peter14
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volume =pi*radius^2*height
Nikhil619
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@ Peter14 I KNOW THAT...im askin if volume of alloy is same as volume of cylinder..
Peter14
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yes, because the alloy is in the shape of the cylinder
shubhamsrg
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the allow is in in the cylinder, so there volumes must be equated
Nikhil619
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oh ok...k i got this..i have 2 more...can i post them now??
Peter14
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sure
shub, you take one, i'll take the other
shubhamsrg
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lol..
:D
(Y)
Nikhil619
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dont worry i can only post one-by-one...
Peter14
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start separate threads
Nikhil619
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One-by-one is easier for me..one itself is hard to understand..2 means gone!
Peter14
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ok, that works