How many water molecules are in a block of ice containing 0.750 mol of water (H2O)

1.51

⋅

10

24

Explanation:

This is a pretty straightforward example of how to sue Avogadro's number to figure out the number of molecules present in a given sample.

In your case, the sample is said to contain  

2.50

moles of water. Now, a mole is simply a very, very large collection of molecules. In order to have  

1

mole of a molecular compound you need your sample to contain  

6.022

⋅

10

23

molecules of that compound.  

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