Kinetics : Consider the reaction, H2(g) + Cl2(g) --> 2HCl(g). The rate of change of H2(g) is -0.012 M/s (moles per second). What is the rate of change of HCl(g)? I have no idea what to do, I've watched videos and more but I still don't get it :/
Please provide a thorough explanation!! Thank you for helping me!

Melting 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.