Which of the following is the best definition of hess' law?

a. heat evolved in a given process can be expressed as the sum of the heats of several processes that, when added, yield the process of interest.
b. the enthalpy of a process is the difference between the enthalpy of the products and the enthalpy of the reactants.
c. since enthalpy is a state function, it will be different if a reaction takes place in one step or a series of steps.
d. at constant pressure the enthalpy change of a reaction is equal to the heat change of a reaction.
e. heat is always released by the decomposition of 1 mole of a compound into its constitute elements.

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

All motion is caused by force? true or false