Question

3. Calculate the number of moles in 3.011x1022 molecules of carbon dioxide.
Your answer​

Answer 1

We have to calculate the number of moles in 3.011 × 10²² molecules of carbon dioxide.

Solution : there are so many formula to find out no of moles.

If mass is given,

mole = given mass/molar/atomic mass

If volume is given at STP/NTP,

mole = given volume (in L)/22.4 L

If the no of atoms/molecules is given,

mole = no of atoms/molecules/Avogadro's number

Now see your questions once again, here no of molecules of carbon dioxide is given, so we have to apply last one.

I.e., mole = no of molecules/Avogadro's number

Here no of molecules = 3.011 × 10²²

Avogadro's number = 6.022 × 10²³

So, mole = 3.011 × 10²²/6.022 × 10²³

= 1/20

= 0.05

Therefore the no of moles is 0.05 of carbon dioxide.

Answer 2

Solution:-

There are so many formula to find out no of moles.

If mass is given,

mole = given mass/molar/atomic mass

If volume is given at STP/NTP,

mole = given volume (in L)/22.4 L

If the no of atoms/molecules is given,

mole = number of atoms/molecules/

Avogadro's number

Now see your questions once again, here no of molecules of carbon dioxide is :-

I.e., mole = no of molecules/Avogadro's number

Here no of molecules = 3.011 x 10²²

Avogadro's number = 6.022 x 10²³

So, mole = 3.011 x 10²²/6.022 x 10²³

=> 1/20

=> 0.5 (ans)

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