- #1
Eclair_de_XII
- 1,083
- 91
Homework Statement
"If a cup of tea (175.0 mL, 90.0°C) is cooled by adding an ice cube (25.0 g, -15.0°C), what is the final temperature of the tea? The heat required to melt ice (heat of fusion) is 80.0 cal/g."
Homework Equations
S.H. of water (solid) = 0.5 cal/g°C
The Attempt at a Solution
1 cal/1 g°C ⋅ 175.0 g ⋅ (x - 90.0°C) = 0.5 cal/1 g°C ⋅ 25.0 g ⋅ 15.0°C + 80 cal/1 g ⋅ 25.0 g
175x - 15750 = 187.5 + 2000.0
175x = 17937.5
x = 102.5°C
This is not adding up. The final temperature should be lower than 90.0°C, not higher.