Answers edited by David Y.

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• A 154 g sample of water at 0oC freezes into ice at °C How many joules (J) of energy are needed for the phase change?
  
• 11. 135 g of aluminum (initially at #"400"^("o")"C"#) are mixed with an unknown mass of water (initially at #"25"^("o")"C"#). When thermal equilibrium is reached, the system has a temperature of #"80"^("o")"C"#. Find the mass of the water?
  
• Question #2171c
  
• How do you calculate enthalpy change?
  
• Question #71344
  
• How to calculate the first and second ionization energies of helium?
  
• Can someone please explain how to find the amount of energy released in a chemical reaction? What formulas do I use and how do I use them?
  
• What is #"Gibbs Free Energy"#?
  
• Question #2e817