Draw three different dibromocyclobutanes (there are six possibilities when including directionality).

The dibromobutanes drawn are:

i.   1,1-dibromocyclobutane

ii.  1,3-dibromocyclobutane

iii. 1,2-dibromocyclobutane

Explanation:

The diagrams of three different dibromocyclobutanes are shown in the attachment below. The dibromobutanes drawn are:

i.   1,1-dibromocyclobutane

ii.  1,3-dibromocyclobutane

iii. 1,2-dibromocyclobutane

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.