Questions asked by EvaB

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• The freezing point depression of potassium ethanoate is greater than that of the other two solutes (camphor and urea) when an equal number of moles of each is used. Can somebody explain this?
  
• What is the binding energy of one mole of 234Th90 if the mass defect is 1.908 g/mol?
  
• Can someone please write the name of the alkyne molecule #4?
  
• What are the names of the following branched alkane molecules?
  
• Do constellation move around if you observe them at the same time?
  
• Suppose you find a rock originally made of potassium-40, half of which decays into argon-40 every 1.25 billion years. You open the rock and find 31 atoms of argon-40 for every atom of potassium-40. How long ago did the rock form?