Question

what is the percent of O in CO2

Answer 1

72.71 . simple google search, you shouldnt waste points

Answer 2

For this case we have the $CO_ {2}$

It is composed of one atom of carbon and two of oxygen.

The atomic mass of carbon and oxygen, which can be found in a periodic table, are given by:

$C: 12 \frac {g} {mol}\\O: 16 \frac {g} {mol}$

Then, we find the atomic mass of $CO_{2}$:

$1 * 12 \frac {g} {mol} = 12 \frac {g} {mol}\\2 * 16 \frac {g} {mol} = 32 \frac {g} {mol}$

Adding we have:

$44 \frac {g} {mol}$

To find the percentage of oxygen, we divide the atomic mass of the two oxygen atoms between that of $CO_{2}:$

$\frac {32} {44} * 100 = 72.73$%

Thus, the percentage of oxygen is 72.73%

Answer:

72.73%