A 20-kg ice cube at 0.0°C has sufficient heat added to it to cause total melting, and the resulting water is heated to 70.0°C. How much heat is added? (For water LF = 334,000 J/kg, LV = 2.256 × 10⁶ J/kg, the c = 4.186 x 10³ J/kg · °C.) (You must type your answer into the input box. You must show your complete work for this problem including all equations in algebraic form and then show your calculations)