Tuesday

March 31, 2015

March 31, 2015

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.

**Answer this Question**

**Related Questions**

chemistry - How many atoms are in 3.14 mol of methane (CH4)? A. 7.56 x 1023 ...

Chem - Superscript 15 How many moles of Pb is 9.3 X 1015 atoms of pb? 1 mol of ...

Chemistry - How would you approach a question like There are 6.02x 10 to the ...

chemistry - what is the mass in grams? a) 3.011 x 10^23 atoms F b)1.50 x 10^23 ...

chemistry - Calculate the mass, in grams, of each of the following. a) 1.2×10^23...

chemistry - How many atoms are in 1.14 mol of propane (C3H8)? A. 7.55 x 1023 ...

chemistry - Determine the number of moles of a) N atoms in 42.5g of Mg(NO3)2 b) ...

chemistry - what is the mass in grams? a) 3.011 x 10^23 atoms F b)1.50 x 10^23 ...

chemistry - what is the mass in grams? a) 3.011 x 10^23 atoms F b)1.50 x 10^23 ...

Science - Chemistry - How many atoms are in 12g of Zinc? There are 6.02 x 10^23 ...