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

question 169

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 heat is required to raise the temperature of $1.90 \mathrm {~kg}$ of 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:

Contributory Negligence

A legal doctrine where if the plaintiff in a negligence case is found to be partly at fault, they may receive reduced or no damages.

Comparative Negligence

A legal doctrine that reduces the amount of damages a plaintiff can recover in a negligence-based claim, based upon the degree to which the plaintiff's own negligence contributed to the cause of their injury.

Wrongful Interference

An unlawful act by one party to disrupt or harm the business relationships or contracts of another party.

Business Relationship

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