Question

What will be the mass of one atom of C-12 in grams?

Answer 1

Mass of one atom of C-12 in grams:

Mass of 1 mole of carbon -12 = 12g
1 mole contains $6.022\times {10}^{23}atoms$.
Thus, mass of $6.022\times {10}^{23}atoms=12g$

Mass of 1 atomof carbon $=\frac{12}{6.022\times {10}^{23}}g$
$=1.99\times {10}^{-23}g$

Thus, mass of one atom of C-12 is $1.99\times {10}^{-23}g$