What is the difference between solid hcl and liquid hcl

What’s the percent by mass of carbon in c10h14n2

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?