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Homework Help: Urgent help needed with volume calculation

  1. Feb 11, 2008 #1
    Please can someone help me with the following question:

    Calculate the volume of ammonia required, in cubic metres at stp, to produce one tonne of ammonium nitrate.

    I know how to work out the mass of ammonia in one tonne of ammonium nitrate but am struggling with volumes....help needed!
  2. jcsd
  3. Feb 11, 2008 #2
    At STP, one mole of an ideal gas occupies 22.4 Litres. 1 Litre=1000 cm^3. Can you carry on from there?
  4. Feb 11, 2008 #3
    I'm still a bit unsure...can you help further please
  5. Feb 11, 2008 #4
    Let m be the mass in grammes of NH3 in one tonne of ammonium nitrate..
    Let M be the molecular weight of NH3.
    The number of moles of NH3 is m/M and the volume of NH3 is
    22.4 (Litre/mole) . (m/M) mole = 22 400 cm3 (m/M)
    =22400(m/M) (cm (1 metre/(100 cm))3
    =0.0224 (m/M) metre3

    Please check my arithmetic!
  6. Feb 12, 2008 #5
    Thanks....I was having trouble with converting volume to mass but now that you have explained this it is now clear. Your help with this is much appreciated...thanks again
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