Question

At 1 atm, how much energy is required to heat 83.0 g H,O(s) at -10.0°C to H, O(g) at 141.0 °C? Use the heat transfer constants found in this table.

Answer 1

The question shows ice at -10^oC being converted to steam at 141^oC. We need to calculae the energy required for the conversion. The process of conversion of ice to steam takes place via five steps.

STEP-I: Ice is heated from -10^oC to 0^oC.

The heat absorbed is calculated by using the specific heat of ice and the equation

STEP-II: Ice is melted at 0^oC.

The heat absorbed is calculated by using the heat of fusion of ice and the equation

STEP-III: Water is heated from 0^oC to 100^oC.

The heat absorbed is calculated by using the specific heat of water and the equation

STEP-IV: Water is vaporized to steam at 100^oC

The heat absorbed is calculated by using the molar heat of vaporization and the equation

STEP-V: Water is heated from 100^oC to 141^oC.

The heat absorbed is calculated by using the specific heat of steam and the equation

Therefore, the energy required is