Question

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

Short answer

The answer is$3.344.{10}^{26}protons$

Step-by-step solution

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.

Finding of calculating the number of protons 

The number n of moles is

$n=\frac{m}{M}=\frac{pV}{M}$

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:

$n=\frac{N}{N_A}\Rightarrow N=n{N}_A$

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

Therefore, the combination is:
role="math" localid="1649075772427" $N=\frac{pV{N}_A}{M}$

Thus

$\frac{1000.0.001.6.02.{10}^{23}}{0.018}=3.344.{10}^{25}molecules$

Thus, the number of protons $n_p$would be

$n_p=10N=3.344.{10}^{26}$