How many total moles are in this mixture?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

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

Heat is the total potential energy of a substance that can be transferred. true false