Question

How many moles of oxygen are in 0.66 moles of co_2 ​2 ​​ ? your answer should have the appropriate number of significant figures. only give the numeric value of your answer. don't include the units?

Answer 1

Answer : There are 1.3 moles of oxygen in 0.66 moles of $CO_{2}$

Explanation : 1 mole $CO_{2}$ contains 1 mole C and 2 mole $O_{2}$. Therefore moles of $O_{2}$ is twice the number of moles of  $CO_{2}$.

0.66 mole  $CO_{2}$ = $(0.66 molCO_{2})\times \frac{(2 mole O_{2})}{(1 mole CO_{2})}$

$(0.66 )\times \frac{(2 mole O_{2})}{(1 )}$ = 1.3 mole $O_{2}$

Therefore 0.66 mole $CO_{2}$ will have 1.3 mole $O_{2}$.

Answer 2

1 mole of $CO_2$ contains one mole of $C$ atom and two moles of  $O$ atoms.

1 mole of $CO_2$ contains 2 moles of $O$.

So, 0.66 mole of $CO_2$ contains:

$0.66\times 2 = 1.32 moles$

Hence, 0.66 mole of $CO_2$ contains 1.32 moles of $O_2$.