The decomposition of copper(ii) nitrate on heating is endothermic reaction. 2cu(no3)2(s) → 2c10(s) + 4no2(g) + o2(g) calculate the enthalpy change for this reaction using the following enthalpy changes of formation. ah! [cu(no3)2) = -302.9 kj mol? ah, (cuo) = -157.3 kj mol? . ah[no2) = +33.2 kj mol.

The enthalpy change for the given reaction is 424 kJ.

Explanation:

We have :

Enthalpy changes of formation of following s:

(standard state)

The equation for the enthalpy change of the given reaction is:

=

=

The enthalpy change for the given reaction is 424 kJ.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.