What mass of the water freezes when metal at -200 degrees C is dropped into 10mL water at 10 degrees C?
A piece of Tungsten is dropped into a cup calorimeter filled with 10mL of water at 10C.
The Tungsten is 60g and is at -200C. The water starts to freeze as the temperature cools to 0C.
What mass of the water freezes as the freezing continues?
Cp Tungsten = 0.132 J/gC, density = 20.5g/cm3
Enthalpy of fusion for water = 6.01 kJ/mol.
Enthalpy vaporization of tungsten = 806.7kJ/mol
Thank you!
A piece of Tungsten is dropped into a cup calorimeter filled with 10mL of water at 10C.
The Tungsten is 60g and is at -200C. The water starts to freeze as the temperature cools to 0C.
What mass of the water freezes as the freezing continues?
Cp Tungsten = 0.132 J/gC, density = 20.5g/cm3
Enthalpy of fusion for water = 6.01 kJ/mol.
Enthalpy vaporization of tungsten = 806.7kJ/mol
Thank you!
1 Answer
Explanation:
The tungsten density and vaporization values are useless for this problem, but you do need to look up the heat capacity of water. The first calculation is the heat transfer to reduce the 10mL of water from
Heat (loss) available from cold metal:
Heat removal from water:
Cool from
Remaining heat sink:
Freezing (heat of fusion of water):