Which step would a student find the molecular formula of a compound from the empirical formula?
multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.
subtract the ratio of the actual mass of the compound to the empirical formula mass from the subscripts of the empirical formula.
divide the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.
add the ratio of the actual mass of the compound to the empirical formula mass to the subscripts of the empirical formula.

The step that would help a student finds the molecular formula of a compound from the empirical formula is by ‘Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.’

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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).