A Substance Has a Melting Point Of $20 ^ { \circ } \mathrm { C }$

question 39

Multiple Choice

A substance has a melting point of $20 ^ { \circ } \mathrm { C }$ and a heat of fusion of $3.4 \times 10 ^ { 4 } \mathrm {~J} / \mathrm { kg }$ 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 $\mathrm { J } / \mathrm { kg } \cdot \mathrm { K } \text { (solid) , } 1000 \mathrm {~J} / \mathrm { kg } \cdot \mathrm { K } \text { (liquid) , }$ and 400 $\text { J/kg } \cdot K \text { (gaseous) . }$ How much heat is required to raise the temperature of 1.90 kg of this substance from $- 4 ^ { \circ } \mathrm { C } \text { to } 106 ^ { \circ } \mathrm { C }$ at a pressure of one atmosphere?

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

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