Write the composition of "Phosphate rock''. 

Write the composition of a composite rocket propellant

Write the composition of Sodium amalgam

Write the chemical composition of rust.

Write down the composition of air in per cent by volume.

Write the composition table for the binary operation multiplication modulo 10\ (xx_(10)) on the set S={2,\ 4,\ 6,\ 8} .

Write an essay on the composition of blood.

The formula of the sulphate of an element M is M_2(SO_4)_3 . Write the formula of its Phosphate.

Describe the composition of anode and cathode in a mercury cell. Write the electrode reaction for this cell.

What are the main components of air ? Write down the composition of three main gases present in air by volume.

What is the percentage composition of each element is zinc-phosphate Zn_(3) (PO_(4))_(2) ? (Zn = 65.5, P = 31, O = 16)