A Substance Has a Melting Point of 20°C and a Heat

question 34

Multiple Choice

A substance has a melting point of 20°C and a heat of fusion of 3.5 × 10⁴ J/kg.The boiling point is 150°C and the heat of vaporization is 7.0 × 10⁴ J/kg at a pressure of 1.0 atm.The specific heats for the solid,liquid,and gaseous phases are 600 J/(kg ∙ K) ,1000 J/(kg ∙ K) ,and 400 J/(kg ∙ K) ,respectively.The quantity of heat given up by 0.50 kg of the substance when it is cooled from 170°C to 88°C,at a pressure of 1.0 atmosphere,is closest to

• A)70 kJ.
• B)14 kJ.
• C)21 kJ.
• D)30 kJ.
• E)44 kJ.

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Definitions:

Materials Price Variance

The difference between the actual cost of materials and the standard cost, multiplied by the actual quantity of materials used.

Variable Manufacturing Overhead

This refers to the manufacturing overhead costs that vary with the level of production, such as utilities or indirect materials.

Materials Price Variance

The variance between the standard cost and the actual expense of materials, factored by the number of materials acquired.

Direct Labor-hours

The total time that production workers spend working on products or production processes, used as a base for applying manufacturing overhead.