Question

::Important questions of chemistry class
1. Define the following terms
a) polyatomic ions
b) Atomicity
c) 1 amu
d) formula unit mass
e) 1 mole​

Answer 1

Answer:

a) A polyatomic ion is an ion composed of more than one atom. The ammonium ion consists of one nitrogen atom and four hydrogen atoms. Together, they comprise a single ion with a 1+ charge and a formula of NH+4. The carbonate ion consists of one carbon atom and three oxygen atoms and carries an overall charge of 2−.

c) An atomic unit of mass is defined as accurately 1/12 the mass of a carbon-12 atom.

d)The mass of the formula unit of a substance is the sum of the atomic masses of all atoms in an ionic compound's formula unit.

e)generally use the mole as the unit for the number of atoms or molecules of a material. One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro's number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole).