Question

Moles of C2H6 in 3.75x10 ^23 molecules of C2H6

Answer 1

Answer : The number of moles of $C_2H_6$ is, 0.622 moles

Solution :

As we know that,

1 mole contains $6.022\times 10^{23}$ number of molecules.

As, $6.022\times 10^{23}$ number of molecules of $C_2H_6$ present in 1 mole of $C_2H_6$

So, $3.75\times 10^{23}$ number of molecules of $C_2H_6$ present in $\frac{3.75\times 10^{23}}{6.022\times 10^{23}}=0.622$ mole of $C_2H_6$

Therefore, the number of moles of $C_2H_6$ is, 0.622 moles

Answer 2

To determine the moles of C2H6 from the number of molecules, we use the avogadro's number to relate moles into molecules. From avogadro's number, 1 mol is equal to 6.022x10^23 molecules. 

 3.75x10 ^23 molecules C2H6 (1 mol / 6.022x10^23 molecules ) = 0.6227 mol C2H6

Hope this answers the question.