Question

what is the formula mass of a compound?

• it is the sum of the atomic mass of all elements in the chemical formula.
• it is the atomic mass of all metals in the chemical formula.
• it is the atomic mass of all non - metals in the chemical formula.

Explanation:

The formula mass (or molar mass) of a compound is calculated by summing the atomic masses of all the elements present in its chemical formula, considering the number of atoms of each element. The first option is incorrect as it only considers non - metals, and the second is incorrect as it only considers metals. The third option correctly states that it is the sum of the atomic masses of all elements in the chemical formula.

Answer:

The option "It is the sum of the atomic mass of all elements in the chemical formula." (the first radio button option in the list of three)