Two Experimental Runs Are Performed to Determine the Calorimetric Properties

question 18

Multiple Choice

Two experimental runs are performed to determine the calorimetric properties of an alcohol which has a melting point of -10.0° C.In the first run,a 200-g cube of frozen alcohol,at the melting point,is added to 300 g of water at 20.0°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 20.0°C and the temperature at thermal equilibrium is 10.0°C.The specific heat capacity of water is 4190 J/kg ∙ K.Assume no heat is exchanged with the styrofoam container and the surroundings.What is the heat of fusion of the alcohol?

• 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:

Compare

Typically refers to a method or function that assesses two values or objects and determines their ordering or if they are equal.

Control Structure

The blocks in programming that analyze variables and choose directions in which to go based on given parameters.

Two-Way Selection

A control structure in programming that allows for two possible paths of execution based on a condition being true or false.

If Statements

Conditional statements that execute a block of code if a specified condition evaluates to true.