The number of atoms in 4.25g of NH₃ is approximately

Which law says that when two elements combine separately with a definite mass of a third element, then the ratio of their masses in which they do so is either the same or some whole number multiple of the ratio in which they combine with each other ?

Which has maximum number of molecules ?

Which law says that during any physical or chemical change, the matter is neither created nor destroyed. however, it may change from one form to another ?

Certain species of atoms of different elements having identical relative masses are called

Assuming fully decomposed, the volume of CO₂ releases at STP on heating 9.85 g of BaCO₃ (atomic mass, Ba = 137) will be

What volume of oxygen gas (O₂) measured at 0^o C and 1 atom is needed to burn completely 1 L of propane gas (C₃H₈) measured under the same conditions ?

The species of an atom which possess different relative masses are called

In the reaction,

When 1 mole of ammonia and 1 mole of O₂ are made to react to completion, then

The number of moles of KMnO₄ that will be needed to react with one mole of sulphite ion in acidic solution is