What is the moral mass of H2O

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

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.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume