A penny carries an Excess charge of 2.5-uC. In order to make thepenny electrically neutral, should you add or remove electrons andhow many?...

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of $+2.4 \mu \mathrm{C} ?$

Because one more off corporal way to six disarray pointed 546 grand. I would calculate the number off copper actions in sleep on the one grand we can captures in number off the copper equals to the weight off the copper divided buys a weight each mo off copper, which gave gives us the total numbers off the most. And then wait. Times is with this 6.0 to 3 times 10 to 23. Which are they? Atoms promote and what gets them number off. The all the atoms is a two point knife. World hunts 10 to 22 atoms and ah ah, because each copper agin has 29 protons and each pro terms have positive. 1.6 times. 10 connective 19 column. We can calculate the total charges by timing off these numbers together, which gives us 1.6 times to Internet active 19 times. 20. My protons in terms two point life four times 10 to 22 atoms and that it gives us 1.36 times 10 to 5 cooler, and it's positive charge and is the negative charge. Uh, cancel out as this a positive charge to make you neutral. Soza Toto connective charges are negative. 1.36 times 10 to 5 cooler

A very simple question. How many electrons contribute one times timber minus seven columns of charge. We simply divide discharged by the charge of one electron to find the total number of electrons that carried this. My charge. So that's one times tend bar minus seven columns divided by charge off each electron, which is 1.6 times tend bar minus 90 In courtrooms, this turns out to be 600 inside 6.3 thanks in part 11. Ella Krantz, That is it.

Who soon this problem. We're told that a penny, um, has a certain charge. So let's write down. He's given so mass is equal 2.5, um grams and the charge Q is equal to two point negative. Two times have them. I assign cool OEMs And then our goal is to get how many charges are on the penny. So, for a we just need todo take this charge and divided by the, um, the charge per electron e to get the number of, um to the number of excess charges. So, um, we just want to do magnitude of Q. So we want to do ah two divided by 1.6 times 10 to the minus 19. So then I got 1.25 times. Um, I guess I just due to Sig Figs. Um, actually, how many show ideo How many of the problems? Oh, too good. So that I could do 1.3 times 10 to the 19 charges and let's see what's next. Um and then and then Ah, what percent of the mass of the pennies are these? So there's, uh So this is this money charges and then I know that, Um, the mass of a charge so massive electron is 9.11 times 10 to the minus 31. Um, kilograms. So let's convert this two kilograms. That's 2.5 times 10 to the minus three kilograms. Um, then, yeah, we need to do Q over east of the number of charges times the mass, um, of the whole penny. Do what exactly do we Oh, yeah. We wanted to find the percent. And then that she actually going our denominator. So we want to find the percent of Oh, no, sorry. Let me rewind a little bit. So this is the number of electrons, and then we want to find the massive for electron. That's an e not have. And then the total mass of the penny is is what I'm calling em. Um, And so now I just need to multiply this all out. Um, so I pull up my calculator. So to 1.600 minus 19 times the mass of the electron 9 11 to 10 to the minus 31 then the mass, the pen iwas 2.5% minus three. So I'm putting that in the dominator and that I got, um that it's only so the ratio of this is four point, um, 4.6 times. So the minus nine, Um, not 19 9 and then So that would make it, um So if if if this ratio comes out to the negative nine, then then it would be to the negative 7% right, cause 2% is like 20.2 Um, so you just, uh you just multiply by 100 then say percent so minus seven per cent.

So in this question, we have a penny, and we want to figure out how many electrons are on the penny moon. Figure out what percent of the electrons are of the total mass of the penny. So let's write down the givens. The mass is 2.5 grams. That's right, that in kilograms, um, so 10 of minus three kilograms. And that's the massive the penny. And the charge of the penny is minus 2.0, times 10 to the minus nine, I think nine Quilmes. And so, um, to get the total number of electrons on the penny, we want to take the total charge and divided by the charge Per electron, which is E e is 1.6 times 10 to the minus 19. That's the charge of the electron columns. And, um so dividing cube I e I got, um let me pull up. So two times. 10 to the minus nine, uh, divided by one point. Except in the minds 19 I got Oh, I become all the zeros. 123456789 10 1.25 times. Um, 10 to the 10 electrons and then for B. We want to get the mass of these all these electrons as a percent of the mass of the penny. So, um, for that, we need the massive all the electron. So we need the mass per electrons we want multiplied by the mass of an electron, which is 9.1 times 10 to the minus 31 kilograms. So then we would say it's Emmy Times this Cuba either. And that's the number of electrons and divided by the massive pay you. So I go and plug bow that into a calculator. Um, let's see. I got 4.6 times 10 to the minus 18 um, and so as a percent, I would multiplied by 100 so it's 10 to minus four point.