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July 23, 2014

July 23, 2014

Posted by **Sarah** on Friday, May 23, 2008 at 10:58am.

I got:

2.81 X 10^24 C atoms or should it be 28.11 x 10^23 C atoms?

5.62 X 10^24 N atoms or should it be 9.34 x 10^23 N atoms?

1.69 x 10^25 O atoms....but are you allowed to do ^25 or should it be 168.7 X 10^23 O atoms I'm confused about exponents again.

also, do I need to worry about rounding to the correct number of signifcant digits when doing these questions?

- chemistry -
**bobpursley**, Friday, May 23, 2008 at 11:38amAlways round to the correct number of significant digits.

Proper scientific notation is X.SY*10^qr

2.84*10^24

5.62*10^24

1.69*10^25 are all correct.

- chemistry - BOB PURSLEY -
**Sarah**, Friday, May 23, 2008 at 12:20pmwould it have still been right if I didn't change the exponent, and say for C atoms, left it at 28.11 X 10^23?

- chemistry - BOB PURSLEY -
- chemistry -
**bobpursley**, Friday, May 23, 2008 at 1:02pmIt is not in correct scientific notation, The number is of course, correct.

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