In a chemical reaction, the elements are always present in a definite proportion by ___.
According to the constant proportion theorem, the elements in a chemical reaction are always present in a definite proportion by their mass.
In a chemical substance the elements are always present in definite proportion by mass.
In a chemical compound, elements are always present in definite proportions by ________.
In a chemical compound, the elements are always present in definite proportions by mass.
In a chemical substance the elements are always present in definite proportions by mass.
State whether the following statement is True or False: In a chemical substance the elements are always present in definite proportions by mass.