Question

How many total atoms are in $H_2O$?

Answer 1

Hint: An atom is the smallest unit of ordinary matter that forms an element . Every solid, liquid, gas, and plasma consists of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

Complete answer:
There are three atoms during a water molecule: an oxygen atom and two atoms of hydrogen, which are bonded together like small magnets. The amount of atoms present within each molecule represents the second factor. 4 hydrogen atoms and a couple of oxygen atoms are found in two water molecules. There are 2 moles of hydrogen atoms during a mole of water molecules and 1 mole of oxygen atoms.
Two hydrogen atoms and one oxygen atom form a water molecule. In its outer shell, one oxygen atom contains six electrons and may accommodate a complete of eight electrons. The outside group of oxygen is filled as two hydrogen atoms are sure to be an oxygen atom.
An atom is the smallest particle of a component , like oxygen or hydrogen. Atoms join together to make molecules. A water molecule has three atoms: two hydrogen (H) atoms and one oxygen (O) atom. That's why water is usually mentioned as H₂O.
The scientific term for water is H₂O. This suggests that in each water molecule there's two hydrogen atoms and one oxygen atom.

Note:
 If you've got a sample that contains only atoms of a specific element, weigh the sample in grams and divide by the relative atomic mass of the element. The quotient tells you the amount of moles. Multiply that by Avogadro's number , and you will determine what percentage atoms the sample contains.