Question

What mass of oxygen is contained in a `36.65*g` mass of carbon dioxide?

Answer 1

About `30*g` of oxygen gas....

Explanation:

We got a `(10*g)/(12.011*g*mol^-1)=0.833*mol` quantity with respect to carbon. And given a formula of `CO_2`, CLEARLY we have a `0.833*mol` quantity with respect to carbon dioxide.....

And so, we have a mass, with respect to `CO_2(g)` of `0.833*molxx44.01*g*mol^-1=36.6*g` of which `10*g` was carbon.

The balance, `36.6*g-10*g=26.6*g` MUST be due to dioxygen gas. Agreed?