Calculate the mass percent of calcium, phosphorus and oxygen in calcium phosphate Ca₃(PO₄)₂.

What is the symbol for SI unit of mole? How is the mole defined?

What is the difference between molality and molarity?

45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below:

2N₂(g) + O₂(g) → 2N₂O(g)

Which law is being obeyed in this experiment? Write the statement of the law?

If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio

(a) Is this statement true?

(b) If yes, according to which law?

(c) Give one example related to this law.