A25.00 ml sample of hbr is titrated with a 0.150 m standardized sodium hydroxide solution. the endpoint was reached when 18.80 ml of titrant had been added. calculate the molar concentration of the hbr.

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