Name

Period

Date

Heat of Fusion Lab

OBJECTIVE

• Use thermochemistry equations to find the heat of fusion for ice.

INFO

• water C_P = 4.184 J/gK
• ice heat of fusion (WYSHG) = 333.6 J/g^oC

MATERIALS

1. calorimeter (2 Styrofoam cups)
2. thermometer, balance
3. ice cube, tap water

DATA Measure to 2 decimal places (hundredths).

1. m_cup = _____ g (only cup)
2. m_cup-water = _____ g (about 85 mL water)
3. T_init = _____ ^oC (of water in cup, about 50^oC)
4. m_towel-ice = _____ g (one ice cube)
5. m_towel = _____ g (damp towel)
6. T_final = _____ ^oC (of water in cup)

PROCEDURE

1. Mass out empty Styrofoam cup (no lid) to hundredths place.
2. Pour about 85 mL warm water (~50^oC) into cup.
3. Mass out cup and water to hundredths place.
4. Put lid on cup.
5. Measure temperature of warm water in cup.
6. Dry off an ice cube and mass out both towel and ice.
7. Place the ice cube into the cup of warm water.
8. Replace lid.
9. Mass out damp paper towel.
10. Measure final (coldest) temperature of water in cup.
11. Enter data, heat_of_fusion.pl

CALCULATIONS Number, show work, space between calculations.

1. m_water <b-a> =
2. m_ice <d-e> =
3. ∆T_water <c-f> = (absolute value)
4. H_f =
5. percent disc. =

WYG - WYSHG

% discrepancy = ----------- X 100 =

WYSHG