Two Experimental Runs Are Performed to Determine the Calorimetric Properties

question 35

Multiple Choice

Two experimental runs are performed to determine the calorimetric properties of an alcohol that has a melting point of -10°C.In the first run,a 200-g cube of frozen alcohol,at the melting point,is added to 300 g of water at 20°C in a styrofoam container.When thermal equilibrium is reached,the alcohol-water solution is at a temperature of 5.0°C.In the second run,an identical cube of alcohol is added to 500 g of water at 20°C and the temperature at thermal equilibrium is 10°C.The specific heat of water is 4190 J/kg • K.Assume that no heat is exchanged with the styrofoam container and with the surroundings.The heat of fusion of the alcohol is closest to

• A) 5.5 × 10⁴ J/kg.
• B) 6.3 × 10⁴ J/kg.
• C) 7.1 × 10⁴ J/kg.
• D) 7.9 × 10⁴ J/kg.
• E) 8.7 × 10⁴ J/kg.

---

Definitions:

Behavioral Tendencies

Behavioral tendencies refer to predictable patterns of behavior and reaction that individuals typically exhibit.

Brain Structures

The physical parts and anatomical areas of the brain, each with specific functions.

Brain Arousal

The state of being physiologically alert and responsive to stimuli.

Biology

The scientific study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy.