Calculate ΔH in kJ/mol for the reaction N2O5(g) → N2O4(g) + 1/2 O2(g) using these reactions:

2 N2O5(g) → 2 N2(g) + 5 O2(g) ΔH = -38.7 kJ/mol
1/2 N2(g) + O2(g) → NO2(g) ΔH = 32.7 kJ/mol
N2O4(g) → 2 NO2(g) ΔH = 51.8 kJ/mol

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answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.