Describe why there are the same numbers of particles in the beginning and at the end of the reaction of iron sulphide

The boiling point of liquids is very high what does it indicate

How many molecules are in 6.0 moles of methane

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world