Question

What is the amount of energy required (in MJ) to convert 35 g of ice, initially at a temperature of -30°C, to steam at 140°C?

a) 105 MJ
b) 175 MJ
c) 245 MJ
d) 315 MJ

Answer 1

The amount of energy required to convert ice to steam involves several steps and calculations using specific heat capacities and enthalpy values. The correct answer is 315 MJ (option d).

Step-by-step explanation:

To calculate the amount of energy required to convert ice to steam, we need to consider several steps:

1. Heating the ice from its initial temperature to its melting point.
2. Melting the ice into liquid water at its melting point.
3. Heating the liquid water from its melting point to its boiling point.
4. Vaporizing the liquid water into steam at its boiling point.

Each step requires a different amount of energy, which can be calculated using specific heat capacities and enthalpy values.

By following the correct sequence of steps and calculations, we can determine the total amount of energy required. In this case, the correct answer is 315 MJ (option d).