If e = MC2 (squared), then matter would be:
M = e/C2 (squared)
Your question is not specific enough. There is no formula for matter. If by "matter" you meant "mass" there are many formulas, not just one. Matter comes in discrete units (rather than infinitesimal units), those units being particles. Protons, electrons and neutrons are examples of such units (though protons and neutrons are not fundamental units since they can be broken apart into smaller units). One possible "formula for matter" would be: m = (#protons)*(mass of proton)+(#electrons)+(mass of electron)+(#neutrons)+(mass of neutrons) which would yield an object's non-relativistic rest mass. Another formula for matter is the relativistic formula for mass: m = (rest mass) * gamma = (rest mass)/sqrt(1-(v^2 - c^2)), where c is the speed of light which is 3*10^8 m/s which is 186,000 miles per second.
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The formula for matter is mass multiplied by particles, or in chemical terms, the chemical formula representing the elements that make up a substance.
Density and state of matter are physical properties, its not chemical =p.
The chemical formula for methane is CH4. It is a simple hydrocarbon gas that is the main component of natural gas and is produced by the decomposition of organic matter.
The formula for calculating mass is mass = density x volume. This formula relates the mass of an object to its density (amount of matter in a given volume) and volume (amount of space an object occupies).
The formula of a dust particle can vary depending on its composition. Common components of dust particles include silicates, metals, and organic matter. However, there isn't a specific chemical formula for dust particles as they are typically a mixture of various substances.
The density (d) to be determined can be calculated by the formula: d = mass / volume , both measured from the same amount of matter.