Describe the process used to measure out a specific mass of a solid

What is the overall order of reaction for rate = k[no]2[o2]

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

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