# Calculate the percent by mass of carbon in "CO"_2?

Dec 15, 2017

27.292%

#### Explanation:

Mass of carbon in 1 mol of $\text{CO"_2 = "12.011 g}$

Mass of 1 mol of $\text{CO"_2 = "44.009 g}$

% "of C" = "12.011 g"/"44.009 g" × 100% = 27.292%

Dec 15, 2017

=27.28%

#### Explanation:

Ok, so first we ned to find the total weight of $C {O}_{2}$ then we are going to take (carbon's weight)/(the total weight).

So, to find the total weight, we need to find the weight of carbon and of oxygen. To do this, just look on most periodic tables and it will show the weight of each of these. Doing so, you will realize that carbon has a weight of $12.0107$ and oxygen has a weight of $15.9994$ (don't forget there are two of these in carbon dioxide).

$= 12.0107 + \left(2 \cdot 15.9994\right)$

$= 44.0095$

Finally, we are just going to take carbons weight ($12.0107$) and divide it by the total weight to find the percentage weight of carbon.

=(12.0107/44.0095)*100%

=0.2729*100%

=27.28%

Hope that helped!
~Chandler Dowd