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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