SCIENCE QUESTIONS about chemical and physical changes (image linked with a question)

I need 1-16

What is the number of atoms in 3.54 mol s

Isopropyl alcohol, (ch3)2choh, is a common solvent. determine the percent by mass of hydrogen in isopropyl alcohol. a) 6.71% h b) 13.4% h c) 25.0% h d) 53.3% h

What is the most common reason for matter changing its state?