The formula mass of potassium fluoride is to be determined. Concept introduction: Isotopes are atoms with the same atomic number but a different mass number. The difference in the mass numbers of isotopes arises due to the difference in the number of neutrons in them. The mass number of an atom is the sum of the protons and neutrons in them. The number of protons of isotopes is the same but the neutron number varies. Due to the same number of protons in the isotopes, they occupy the same position in the periodic table. The formula to calculate the atomic mass of an element is, Atomic mass = ∑ ( isotopic mass ) ( fractional abundance of isotope ) (1) The formula of an ionic compound represents the total number of the ions of all the elements present in it. The general formula to calculate the formula mass of a compound is as follows: Formula mass of the compound = [ Σ ( number of atoms of the element ) ( atomic mass of the element ) ] (2)

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Chapter 2, Problem 2.138P

Interpretation Introduction

Interpretation:

The formula mass of potassium fluoride is to be determined.

Concept introduction:

Isotopes are atoms with the same atomic number but a different mass number. The difference in the mass numbers of isotopes arises due to the difference in the number of neutrons in them. The mass number of an atom is the sum of the protons and neutrons in them. The number of protons of isotopes is the same but the neutron number varies. Due to the same number of protons in the isotopes, they occupy the same position in the periodic table.

The formula to calculate the atomic mass of an element is,

Atomic mass=∑(isotopic mass)(fractional abundance of isotope) (1)

The formula of an ionic compound represents the total number of the ions of all the elements present in it.

The general formula to calculate the formula mass of a compound is as follows:

Formula mass of the compound=[Σ(number of atoms of the element)(atomic mass of the element)] (2)

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