What is the mass number of an iron atom that has 28 neutrons?

At stp, what is the volume of 1 mole of co2?

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

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