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

question 63

Multiple Choice

A substance has a melting point of 20°C and a heat of fusion of 3.4 × $10^4$ J/kg.The boiling point is $150 ^ { \circ } \mathrm { C }$ and the heat of vaporization is $6.8 \times 10^4 \mathrm {~J} / \mathrm { kg }$ at a pressure of one atmosphere.The specific heats for the solid,liquid,and gaseous phases are 600 J/kg ∙ K (solid) ,1000 J/kg ∙ K (liquid) ,and 400 J/kg ∙ K (gaseous) .How much thermal energy is required to raise the temperature of $1.90 \mathrm {~kg}$ this substance from $- 4 ^ { \circ } \mathrm { C }$ to $106 ^ { \circ } \mathrm { C }$ at a pressure of one atmosphere?

• A)260 kJ
• B)190 kJ
• C)230 kJ
• D)92 kJ
• E)320 kJ

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Definitions:

Variable Manufacturing Overhead

Overhead costs that fluctuate directly with the volume of production output, such as utilities and indirect materials.

Raw Materials

The basic, unprocessed inputs used in manufacturing to produce goods and finished products.

Price Variance

The difference between the actual cost and the standard or expected cost of an item or service.

Direct Labor-Hours

The total hours of work directly spent on producing a specific product or service.