Question

How much energy (in KJ) is required to convert 50.0g of ice at -30°C to steam at 130°C?

A) 3.22 KJ
B) 9.48 KJ
C) 6.70 KJ
D) 7.16 KJ

Answer 1

To convert ice at -30°C to steam at 130°C it requires the energy from heating the ice, melting the ice, and heating the resulting water.

Step-by-step explanation:

To calculate the energy required to convert ice at -30°C to steam at 130°C, we need to consider the different steps involved in the process:

1. Heating the ice from -30°C to 0°C (melting point): Q = mass × specific heat capacity × temperature change
2. Melting the ice at 0°C: Q = mass × heat of fusion
3. Heating the resulting water from 0°C to 130°C: Q = mass × specific heat capacity × temperature change

Using the given values and the specific heat capacities and heat of fusion of water, we can calculate the total energy required.

The correct answer choice is C) 6.70 KJ.