Calculate the number of moles in 2.2 g of K2SO4

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

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?

Which of the following is not a characteristic of s waves?