Analysis of a gaseous hydrocarbon compound gives the following percent composition by mass: 85.7% C and 14.3% H.
(a) Define empirical formula and molecular formula.
(b) Determine the empirical formula of the hydrocarbon.
(c)0.25 g of this compound occupies a volume of 100 mL at STP. Determine the molar
mass and the molecular formula of the hydrocarbon.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

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).

gold is my favorite solid.

your answer is c) plasma

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