The standard enthalpy of formation. The enthalpy of formation is the energy change when 1 mole of a substance is formed from its constituent elements in their standard states.Particular points to note: 1  The elements are in their usual states under standard conditions. i.e at 25ÂºC and 1 atmosphere pressure (100 kPa).he standard enthalpy of formation. The enthalpy of formation is the energy change when 1 mole of a substance is formed from its constituent elements in their standard states.
Microsoft bumped the layout to 104 keys with the addition of Windows keys and a Menu key a bit later, but the layout is essentially the same. This is a rule-of-thumb, as no two keyboards are exactly the same. The number of keys on a full size keyboard varies, some having media keys, etc.
The rest depends on what what kind of keyboard you have and what program you are using will determine their functions. It also depends on whether you use the F key on it's own or in combination with another key like the Alt or Ctrl keys on a PC keyboard and/or the Function key on a laptop.For instance, I have a multi functional keyboard and depending what mode it is in, it completely changes the functions of the F keys.unction keys (the F-keys) are found on most every computer, but their usage is not standard. Many programs assign special functions to these keys (hence their name), and computer manufacturers also assign system-level actions to certain keys.