does anyone know how to find the number of electrons in an element given there mass? ex: the number of electrons in a neutral aluminum with a mass of 29 g?

Question

jfraser · Answer

the mass of an element doesn't actually matter if you're asking about electrons. The mass of an electron is so small compared to the overall mass of the atom that we usually say it has "charge, but no mass". If you know you have an atom of aluminum, we also assume that the number of protons and electrons will be the same. The word "atom" implies neutral here. If the atom is aluminum, it will have 13 protons, and 13 electrons.

The mass would be necessary if we needed to know numbers of neutrons, as well.

anonymous · Answer

ok i tried that but it didnt give me the answer, one sec ill give you the question

anonymous · Answer

A piece of titanium has a mass of 89 g and is initially electrically neutral. It is then charged with q = +0.6 µC.
(a) How many electrons were removed from the piece of titanium in the charging process?
3.75E12 electrons

(b) What fraction of the total number of electrons in the piece of titanium does the number in part (a) represent?
removed electrons / total electrons = ?

anonymous · Answer

so i need help in part b i figured out what a was but i couldnt get the answer for b

jfraser · Answer

the 89g of titanium represents a certain number of titanium atoms. each titanium atom contains 22 electrons. Each electron possesses 1.6x10^-19C worth of charge.

Find the total number of electrons that 89g of titanium should have.

Find the total number of electrons that generate the charge of 0.6microC.

Find the ratio of the 2 and turn it into a percentage.