Question

define the term molecular mass . state and explain the law of conservation of mass with example .

Answer 1

The total mass of the atom present in the molecule is known as molecular mass.

A/c to làw of conservation of mass of mass of molecule will neither be created nor be distroy
example;- CaCo3>Ca0+Co2

Answer 2

molecular mass=sum of atomic mass of all elements present in a molecule is called molecular mass .

law of conservation of mass :-according to this law , during a chemical reaction matter is neither created nor destroyed .
rather it converted from reactant to product .
ex:-
H2+Cl2----> 2HCl
above equation we see that reactant mass is equal to sum of product mass
but reactant change into product.