The atomic number of H2O is 18 hence it contains 18 protons. Hope this helps.
Answer:
<h2>0.94 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula

From the question we have

We have the final answer as
<h3>0.94 g/mL</h3>
Hope this helps you
Hydrogen is a
covalent bond. (A bond where one or more pairs of electrons are shared by two atoms)
Human teeth are made up of four different types of tissues.
C. Distance from Earth
The observed brightness of a star (the apparent magnitude) to an absolute magnitude, you need to know the distance [d], to the star. Alternatively, if we know the distance and the apparent magnitude [m] of a star, we can calculate its absolute magnitude [d].
*paraphrased from "COSMOS.com"