Defining standard enthaply change of each

Question 1

Define standard enthalpy change of reaction

Answer 1

Enthaply change measured at 100kPa and 298K, when number of moles of substance react.

Question 2

Define standard enthalpy change of combustion

Answer 2

Is the enthalpy change measured at 100kPa and a specified temperature 298K when one mole of substnace is completely burned in oxygen

Question 3

Define formation

Answer 3

measured at 100kPa and 298K when one mole of a substance is formed from element in its standard state

Question 4

Define neutrisation

Answer 4

measured at 100kPa and temperature of 298K when one mole of water is produced by neutrisation of an acid with an alkali

Question 5

What is hesses law

Answer 5

Enthaply change is independant to the route taken between intial and final states