Substance a Has a Normal Melting Point of -25

Multiple Choice

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