Enthalpy of Reaction: Using standard enthalpies of formation (AHY) from Table A4.3 in your textbook or below, calculate AH° for the following reactions.
2 NH3(g) + 3 O2(g) + 2 CH4(g) → 2 HCN(g) + 6 H2O(g) (1pt)
Ca3(PO4)2(s) + 3 H2SO4(aq) + 3 CaSO4(s) + 2 H3PO4(aq) (1 pt)
2 NO2(g) → N204(g) (1 pt)
2 Al(s) + Fe2O3(s) → Al2O3(s) + 2 Fe(s) (1 pt)
Substance
Ca3(PO4)2(s)
H3PO4(aq)
AH (kJ/mol)
-4132
-1277

i think 4.44 moles

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

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).