# Find the mass

1. Jan 6, 2005

### vt33

What is the mass (in grams) of 6.022 x 10^6 atoms Carbon 12? I am given the equation 1 amu=1.6606 x 10^-24 g, but I'm not sure if I should be using this in my conversion factor or not. Can anyone tell me how to set this up? I have a few ideas but unfortunately I don't have any way to check my answers to see if they're correct. Thanks in advance

2. Jan 6, 2005

### dextercioby

* 1 amu (apud 'atomic mass unit') is,by definition,the 12-th part of the mass of an atom of C-12,or numerically,$\sim 1.66\cdot 10^{-27} Kg$
** So from "*" u can find the mass of a C-12 atom.
***Knowing the mass of an atom,it won't be too hard to find the mass of $6.022 \cdot 10^{6}$ atoms.

Daniel.

3. Jan 7, 2005

### poolwin2001

6.022 x 10^23 is avagadro number N,N no: atoms weigh 1 amu.

4. Jan 7, 2005

### Gokul43201

Staff Emeritus
No poolwin, the mass of $N_{av}$ atoms is the molar mass of the element.

As Dexter has said already, $1~ amu =\frac {mass~of~a~C-12~atom}{12}$