Cha-Ching

Most popular questions and responses by Cha-Ching
  1. CHEMISTRY

    How much heat energy is needed to convert 125.0g of ice from -27.0ºC to a liquid at 50.0ºC?

    asked on December 16, 2011
  2. CHEMISTRY

    1.Calculate the enthalpy change (ΔHºrxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. The enthalpy of formation of liquid water is -285.8 kJ/mol.) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) 2.Do

    asked on December 16, 2011
  3. Beginner Chemistry

    How much heat energy is needed to convert 125.0g of ice from -27.0ºC to a liquid at 50.0ºC?

    asked on December 19, 2011
  4. CHEMISTRY

    A 47.5g sample of metal is heated to 300.0ºC and placed in a calorimeter containing 75.0g water at 22.0ºC. The final temperature of the system is 40.0ºC. What is the specific heat of the metal? (the specific heat of water is 4.18 J/g ºC) Thanks for

    asked on December 16, 2011
  5. Beginner Chemistry!

    How much heat is lost by 65g of silver when it cools from 325ºC to -25ºC? (the specific heat of Ag(s) is 0.24 J/g ºC)

    asked on December 19, 2011
  6. CHEMISTRY

    How much heat is lost by 65g of silver when it cools from 325ºC to -25ºC? (the specific heat of Ag(s) is 0.24 J/g ºC)

    asked on December 16, 2011