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Chapter 18: Q. 42 (page 512)

The molecular mass of water (H2O) is A = 18. How many protons are there in 1.0 L of liquid water?

Short Answer

Expert verified

The answer is3.344.1026protons

Step by step solution

01

Description of the molecule of water 

The molecular mass of water (H2O) is A = 18.

In water, one molescule has 10 protons, in which eight from oxygen atom as well as one from each hydrogen.

02

Finding of calculating the number of protons 

The number n of moles is

n=mM=pVM

In this case V is the volume and m as well as M is the molar mass is the mass.

Thus the number of moles is:

n=NNA⇒N=nNA

In this case N is the total number of molecules as well as the avogadro number is NA.

Therefore, the combination is:
role="math" localid="1649075772427" N=pVNAM

Thus

1000.0.001.6.02.10230.018=3.344.1025molecules

Thus, the number of protons npwould be

np=10N=3.344.1026

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