Calculate the number of moles of C2H6 in 4.11×10234.11×1023 molecules of C2H6.

Express your answer using three significant figures.

0.683 moles of C₂H₆

Explanation:

We begin from this:

1 mol of anything has 6.02×10²³ molecules.

This is the NA (Avogadro's Number), therefore we solve the question by a rule of three:

If 6.02×10²³ molecules are contained in 1 mol of C₂H₆

Then, 4.11×10²³ molecules will be contained in (4.11×10²³ . 1) / 6.02×10²³ = 0.683 moles

your answer would be “dry”