Math Help - [SOLVED] coulombs law help

1. [SOLVED] coulombs law help

not exactly sure what to do ...

How many electrons make up a charge of -30.0 micro coulombs ? [1.9 x 10^14]

2. Originally Posted by rock candy
not exactly sure what to do ...

How many electrons make up a charge of -30.0 micro coulombs ? [1.9 x 10^14]

Charge of an electron is -1.6 x 10^(-19) Coulomb

1 Micro coulomb = 10^(-6) C

Anything else required??

3. no i knew that its 3.0 * 10 ^-6 C ... im not sure how they got 1.9*10^14 as an answer

4. Originally Posted by rock candy
no i knew that its 3.0 * 10 ^-6 C ... im not sure how they got 1.9*10^14 as an answer
Number of electrons in 1.6 * 10^(-19) C = 1

So number of electrons in 30 * 10^(-6) C

$= \frac{30 * 10^{(-6)} C}{1.6 * 10^{(-19)} C}$

$= \frac{30 * 10^{(-6+19)} }{1.6}$

$= 1.9*10^{14}~ electrons$

5. LOL omg ... i think im sleepy ... i kept doing this

1.6*10^-19 / 3.0*10^-6 ... thanks