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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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mass= density * volume density is given volume = pi r^2 h fine mass 12% of mass is the final answer use appropriate units.
oh.. we should take v of cylinder as volume?

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Other answers:

and they've asked number of cobalt is that 12% of mass?
ahh okay 12% of that = mass of cobalt atoms in 1 mole of cobalt = avagadros no. atoms in given mass = ?
12 % of that? what is that? no.of atoms? or no.of moles?
looks like 12% by mass
12% of that , that'll give mass of cobalt in the compound
what is 'that'?
"that" is the mass of the cylinder I think
that is mass of the compound in the given volume -_-
ok so mass of the alloy..right?
yo B| sorry if u feel im dumb..but hw am i supposed 2 find mass of alloy?
mass = density * volume -_-
Volume? again volume of cylinder?
volume =pi*radius^2*height
@ Peter14 I KNOW askin if volume of alloy is same as volume of cylinder..
yes, because the alloy is in the shape of the cylinder
the allow is in in the cylinder, so there volumes must be equated
oh ok...k i got this..i have 2 more...can i post them now??
sure shub, you take one, i'll take the other
lol.. :D (Y)
dont worry i can only post one-by-one...
start separate threads
One-by-one is easier for itself is hard to understand..2 means gone!
ok, that works

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