What does pressure measure
A. The temperature of a substance
B. The number of molecules present
C. The force of colliding particles
D. The volume occupied by particles

What is the mass of 8 moles of sodium atoms

In which reaction is precipitation occurring?

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