Can you help me with number 12 please ?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

What is the molar mass of ca(cio4)2

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