How many total electrons, protons, and neutrons are in benzene, C6H6?

Answer 1

It's composed of the most common isotope of carbon and hydrogen which is carbon-12 and hydrogen-1.

Carbon-12 has 6 protons, 6 neutrons and 6 electrons.

Hydrogen-1 has 1 proton and 1 neutron.

So...

Protons: (6 + 1) * 6 = 42
Neutrons 6 * 6 = 36
Electrons (6 + 1) * 6 = 42

Answer 2

The posters above are correct, insofar as they consider the most common isotopes of carbon and hydrogen.

The numbers change, of course, if you are using other isotopes of the two elements, for example --

C6D6 (hexadeuterobenzene) would have 42 protons and 42 electrons, but also 42 neutrons.

If the carbon in C6H6 was carbon 14, instead of carbon 12, then the protons and electrons remain the same at 42 each, but the number of neutrons goes to 48!

So one must be careful to ensure you know which isotopes you're dealing with in advance . . .

Answer 3

42 protons
42 electrons
36 nuetrons