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Questions regarding volume after evaporating and lever equilibrium

  1. Nov 5, 2012 #1
    Hello.
    I am preparing for certain exams and I encountered these question. Can you guys help me to solve these ones?
    25ahvuh.jpg

    The 1st one I tried to apply formula about density (p=m/v), but I guess that I need to solve through that ice cube. That I firstly sort out the number of atoms in ice cube and then I'll convert it into steam? I have no idea how to solve it.

    The second one is mostly about lever system. I tried to use the formula (m=fd), but i dont know how to put figures into it to make it stable. Does anyone have an idea?


    Thanks a lot!
     
    Last edited: Nov 5, 2012
  2. jcsd
  3. Nov 5, 2012 #2
    for those who concerned I solved the second one:
    it's=
    1000 x 1.5 = 100 x 4.5 + 1.5x
    x=700N

    I hope somebody will help me with the first one:)
     
  4. Nov 6, 2012 #3

    haruspex

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    What is the molecular mass of ice?
    What is the mass of one mole of ice?
    How many moles in the cube?
    What volume would that many moles of a gas occupy at room temperature and pressure?
    What volume would it then occupy at room pressure but 100C?
     
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