How many atoms are there in 1 mole of H2O, and how would you calculate this?

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Mar 29, 2017

A mole refers to #6.022 * 10^23# items. #H_2O# has 2 hydrogen atoms and 1 oxygen atom...so a total of 3 atoms in each #H_2O#.

Therefore #(6.022 * 10^23)* # (3 atoms) #=18.066 * 10^23#

Then we need to change the answer into proper scientific notation:
#18.066 * 10^23 = 1.8066 * 10^24#

Lastly, change to the proper number of significant figures. There are 4 significant figures in 6.022. Due to this we need to also have 4 significant figures in the final answer, so we would round #1.8066 * 10^24 to 1.807 * 10^24#

So, your final answer is #1.807 * 10^24#

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Answer:

You calculate how many atoms are in 1 mole of #"H"_2"O"# by using Avogadro's number.

Explanation:

You'd go about calculating this by using Avogadro's number, which links the number of atoms or molecules of a substance with the number of moles of that substance you have.

According to this relationship, every mole has #6.022 * 10^(23)# atoms (or molecules, depending on the substance).

Since water is a molecule, 1 mole of water will always have #6.022 * 10^(23)# molecules of water.

LIkewise, 1 mole of #"O"_2#, for example, will have #6.022 * 10^(23)# molecules of diatomic oxygen, 1 mole of sulfuric acid will have #6.022 * 10^(23)# #H_2SO_4# molecules, 1 mole of copper will have #6.022 * 10^(23)# atoms of copper, and so on.

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