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

question 63

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A substance has a melting point of 20°C and a heat of fusion of 3.4 × 10410^4 J/kg.The boiling point is 150C150 ^ { \circ } \mathrm { C } and the heat of vaporization is 6.8×104 J/kg6.8 \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 kg1.90 \mathrm {~kg} this substance from 4C- 4 ^ { \circ } \mathrm { C } to 106C106 ^ { \circ } \mathrm { C } at a pressure of one atmosphere?

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