How long would it take to turn ice back to water?

How many kJ of energy would it take to melt a 5.00 pound bag of ice at 0.0c?

• how many kJ of energy would it take to melt a 5.00 pound (2.27kg) bag of ice at 0.0c and turn it to room temperature water at 20.0c? Need an explanation on how to solve this, thank ...show more

• Answer:

  Hello naoko : Get the two heats required : ---------------------------------------... Q1 = ( m ) ( hsf ) hsf = latent enthalpy/heat of fusion of water at 0.0 C Q1 = ( 2.27 kg ) ( 333.7 kJ/kg ) Q1 = 757 kJ <------------ Q2 = heat to heat liwuid water formed from 0.0 C to 20.0 C Q2 = ( m ) ( Cp ) ( T2 - TFP ) Q2 = ( 2.27 kg ) ( 4.184 kJ / kg - C ) ( 20.0 C - 0.0 C ) Q2 = 190 kJ <------------------- QTotal = Q1 + Q2 QTotal = ( 757 kJ + + ( 190 kJ ) Qtotal = 947 kJ <----------------------