Question

In a compound, the elements are _____ in a _____ proportion by mass

• A. chemically combined
• B. fixed

Answer 1

Law of Definite proportion:

• The Law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass.
• For example, any sample of pure water contains 11.19% hydrogen and 88.81% oxygen by mass.
• The composition will be fixed irrespective of how they are prepared or come from.

Hence, in a compound, the elements are chemically combined in a fixed proportion by mass.