Question

A sealed flask contains 1.3 x 10^25 molecules of CO2. How many moles of CO2 are in the flask?

Answer 1

A mole of anything contains 6.022x10^23 items. so we need to divide this

1.3 x 10^25 / 6.022 x 10^23 = 21.59 moles

Answer 2

Answer : The moles of $CO_2$ in the flask are, 21.58 moles.

Solution :

As we are given the molecules of $CO_2$ in the flask are =$1.3\times 10^{25}$. Now we have to calculate the moles of $CO_2$ in the flask.

As, $6.022\times 10^{23}$ molecules of $CO_2$ present in 1 mole of $CO_2$.

So, $1.3\times 10^{25}$ molecules of $CO_2$ present in $\frac{1.3\times 10^{25}}{6.022\times 10^{23}}=21.58$ moles of $CO_2$.

Therefore, the moles of $CO_2$ in the flask are, 21.58 moles.