Consider the reaction 3A + 4B --2C + 2D. The standard enthalpy of formation for A, B, Cand D are -309.0,55.0, -245.5, and -323.7, respectively in J/mol. What is the
standard enthalpy change for the reaction in kJ/mol?

your mom.com . : 0000

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).

the objects have the same charge is correct.

nathan lee