Neodymium and dysprosium are two REEs that are considered “Critical Elements” in the medium-term (2015–2025). Explain why these two elements are considered important for present and future clean energy technologies and why there is a supply risk associated with those elements.

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?