Answer:
a) element, compound & mixture
b) compound
c) compound
Step-by-step explanation:
( a )The law of mass conservation -
It is applicable to all — the elements, compounds and mixtures .
( b) The law of definite composition -
It applies to only compounds ,since , it refers to a definite , or a constant , composition of the elements in a compound .
( c) The law of multiple proportions -
It is applicable to only compounds ,
since , it refers to the combination of elements to form a compound .