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How many molecules of H2O in 100kg of snow? dont know where the density comes in

  1. Dec 15, 2009 #1
    How many molecules of H2O in 100kg of snow?? dont know where the density comes in!!

    1. The problem statement, all variables and given/known data

    How many molecules of H2O are there in 100kg of snow? Density of snow is given as 800 kg/m3

    2. Relevant equations

    1 mole = 6.023x10^23 molecules
    mass/molecular mass = number of moles


    3. The attempt at a solution

    This is my attempt, ignoring the density.

    1 mole of H2O = 6.023x10^23 molecules of H2O

    Hence 18g H2O contains 6x10^23 molecules
    1g = 3.346x10^22 molecules
    100,000g (100kg) = 3.346x10^27 molecules of H2O

    Where/how does the density come into it???
     
  2. jcsd
  3. Dec 15, 2009 #2

    Ygggdrasil

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    Science Advisor

    Re: How many molecules of H2O in 100kg of snow?? dont know where the density comes in

    Your solution is correct. You don't need the density to solve the problem, so it's there to confuse you.
     
  4. Dec 16, 2009 #3
    Re: How many molecules of H2O in 100kg of snow?? dont know where the density comes in

    Excellent. Thanks man
     
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