A sample of sodium has a relative abundance of 75% with a mass number of 23, a relative abundance of 20% with a mass number of 22 and a relative abundance of 5% with a mass number of 24. What is the average atomic mass?

The average atomic mass of Sodium : 22.85

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Mass atom X = mass isotope 1 . % + mass isotope 2.% + ....

isotope 1 : 75%, mass number = 23

Isotope 2 : 20%, mass number = 22

Isotope 3 : 5%, mass number = 24

The average atomic mass :

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

gas

explanation:

smoke is the matter of a gas