Which set of coefficients will balance this chemical equation? __pbs(s) + __o2(g) → 2pbo(s) + 2so2(g)

A two in both of the blanks will balence the equation. It will look like so:

2PbS(s) + 2O2(g) --> 2PbO(s) +2SO2(g)

The balanced equation is:

2 PbS(s) + 3 O₂(g) → 2 PbO(s) + 2 SO₂(g)

Explanation:

The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

Then, you must balance the chemical equation.

The subscripts next to each atom indicates the number of atoms in the equation. These must be added to observe the amount of each element on each side of the reaction. If the same atom appears in more than one molecule, you must add its quantities.

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.  

So in this case you have:

__PbS(s) + __O₂(g) → 2 PbO(s) + 2 SO₂(g)

Left side:  1 lead (Pb), 1 sulfur (S) and 2 oxygen (O).

Right side:  2 lead (Pb), 2 sulfur (S) and 6 (2+2*2) oxygen (O)

__PbS(s) + 3 O₂(g) → 2 PbO(s) + 2 SO₂(g)

Left side:  1 lead (Pb), 1 sulfur (S) and 6 (3*2) oxygen (O).

Right side:  2 lead (Pb), 2 sulfur (S) and 6 (2+2*2) oxygen (O)

2 PbS(s) + 3 O₂(g) → 2 PbO(s) + 2 SO₂(g)

Left side:  2 lead (Pb), 2 sulfur (S) and 6 oxygen (O).

Right side:  2 lead (Pb), 2 sulfur (S) and 6  oxygen (O)

You can see that you finally have the same amount of each element on each side of the chemical reaction. So the balanced equation is:

2 PbS(s) + 3 O₂(g) → 2 PbO(s) + 2 SO₂(g)

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).