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Nikhil619

  • 3 years ago

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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  1. shubhamsrg
    • 3 years ago
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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.

  2. shubhamsrg
    • 3 years ago
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    find*

  3. Nikhil619
    • 3 years ago
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    oh.. we should take v of cylinder as volume?

  4. shubhamsrg
    • 3 years ago
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    yep

  5. Nikhil619
    • 3 years ago
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    and they've asked number of cobalt atoms..how is that 12% of mass?

  6. shubhamsrg
    • 3 years ago
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    ahh okay 12% of that = mass of cobalt atoms in 1 mole of cobalt = avagadros no. atoms in given mass = ?

  7. Nikhil619
    • 3 years ago
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    12 % of that? what is that? no.of atoms? or no.of moles?

  8. Peter14
    • 3 years ago
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    looks like 12% by mass

  9. shubhamsrg
    • 3 years ago
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    12% of that , that'll give mass of cobalt in the compound

  10. Nikhil619
    • 3 years ago
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    what is 'that'?

  11. Peter14
    • 3 years ago
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    "that" is the mass of the cylinder I think

  12. shubhamsrg
    • 3 years ago
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    that is mass of the compound in the given volume -_-

  13. Nikhil619
    • 3 years ago
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    ok so mass of the alloy..right?

  14. shubhamsrg
    • 3 years ago
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    yo B|

  15. Nikhil619
    • 3 years ago
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    look..im sorry if u feel im dumb..but hw am i supposed 2 find mass of alloy?

  16. shubhamsrg
    • 3 years ago
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    mass = density * volume -_-

  17. Nikhil619
    • 3 years ago
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    Volume? again volume of cylinder?

  18. Peter14
    • 3 years ago
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    volume =pi*radius^2*height

  19. Nikhil619
    • 3 years ago
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    @ Peter14 I KNOW THAT...im askin if volume of alloy is same as volume of cylinder..

  20. Peter14
    • 3 years ago
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    yes, because the alloy is in the shape of the cylinder

  21. shubhamsrg
    • 3 years ago
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    the allow is in in the cylinder, so there volumes must be equated

  22. Nikhil619
    • 3 years ago
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    oh ok...k i got this..i have 2 more...can i post them now??

  23. Peter14
    • 3 years ago
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    sure shub, you take one, i'll take the other

  24. shubhamsrg
    • 3 years ago
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    lol.. :D (Y)

  25. Nikhil619
    • 3 years ago
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    dont worry i can only post one-by-one...

  26. Peter14
    • 3 years ago
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    start separate threads

  27. Nikhil619
    • 3 years ago
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    One-by-one is easier for me..one itself is hard to understand..2 means gone!

  28. Peter14
    • 3 years ago
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    ok, that works

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