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#### zerox0o

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« on: September 04, 2009, 02:38:40 PM »
i have to do these 2 problems, but i keep on getting them wrong. please help me asap!!! it's urgent please!!!

3. A sample of electrons is found to have a total charge of -2.24x10^10C. How many electrons are in this sample?
Enter numeric answer only.

(i did -2.24x10^10 C/ 1.602176487x10^-19) = -1.398e29  <<< but it's wrong T__T

4. What is the mas of the above sample of electrons in grams?
Enter a numerica answer only.

( i did  -1.398e29 x9.1093826x10^-28) = -127.349g and it's wrong T__T

#### Borek

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« Reply #1 on: September 04, 2009, 02:49:58 PM »
You can't have negative number of electrons. Besides, 1010x10-19 is not 1029.
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#### renge ishyo

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