Question

Howmany atoms are contained in 42.03 grams of Carbon? (scientific notation
with 4 significant digits) Please Help!!!!

Answer 1

N=n*Na

Answer 2

What?

Answer 3

calculate how many moles 42.03 grams of carbon is
To do this you divide 42.03 by the molecular mass of carbon (you can find it on http://ptable.com/ )
then multiply it with avogadro's number (6.022*10^23)

Answer 4

So it should be 42.03 g C * 1/12.011 *( 6.022*10^23)?

Answer 5

yes \(\sf\Large\frac{42.03 g~C}{12.011}*\large(6.022*10^{23})\)

Answer 6

i did the calculation but i got the wrong answer , i got 2.107 *10 ^23 , the answer sheet showed me otherwise which is 1.806*10^24 I'm lost

Answer 7

I'll recalculate it:

42.03 gram Carbon
MW carbon = 12.011
So \(\sf\large\frac{42.03}{12.011}\)= 3.499 mol carbon

From mol to number of atoms = amount of moles multiplied by Na (avogatro's number)
\(\sf3.499 * 6.022*10^{23}\) = \(\underline{\color{red}{\sf 2.107*10^{24}}}\) carbon atoms.
Somethings wrong with your answer sheet.

Answer 8

Ok thank you.