Substance A has a normal melting point of -25.0°C, a heat of fusion of 1200 J g-1; specific heats for the solid and the liquid are 3.00 and 6.20 J g-1 °C -1, respectively. How much heat will be required to change 150 grams of substance A from a solid at -40.0°C to a liquid at +70.0°C?
A) 1.52 × 105 J
B) 1.81 × 105 J
C) 2.21 × 103 J
D) 2.29 × 105 J
E) 2.75 × 105 J
Correct Answer:
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