Calculate the heat change in calories for vaporization of 30.0g of water at 100degrees C

Which statement about sound is not true? a. air particles travel with sound waves. b. sound waves cannot travel through a vacuum. c. sound waves exist even if no one hears them. d. air particles vibrate along the path of a sound wave.

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Which one of the following substances would be the most soluble in ccl4? na2so4 h2o ch3ch2ch2ch2oh c4h10 hi