Question 10

In three moles of ethane (C₂H₆), calculate the following:
(i) Number of moles of carbon atoms.
(ii) Number of moles of hydrogen atoms.
(iii) Number of molecules of ethane.

Answer

Mole is a latin term which means a pile or mass of stones placed in sea. In Chemistry a mole represents Avogadro’s number(6.022 X 10²³ particles)

(i) 1 mole of C₂H₆ contains 2 moles of carbon atoms(because 2 carbons are present in the formula of ethane)

∴ Number of moles of carbon atoms in 3 moles of C₂H₆

= 2 × 3 = 6

(ii) 1 mole of C₂H₆contains 6 moles of hydrogen atoms(because 6 hydrogen atoms are present in ethane)

∴ Number of moles of carbon atoms in 3 moles of C₂H₆

= 3 × 6 = 18

(iii) 1 mole of C₂H₆contains 6.023 × 10²³ molecules of ethane(because 1mole = 6.022 x 10²³)

∴ Number of molecules in 3 moles of C₂H₆

= 3 × 6.023 × 10²³ = 18.069 × 10²³

3 Comment(s) on this Question

Hoovakka 2019-09-14 07:11:32

Thanks

Abhishek layek 2019-06-23 20:54:11

Replace carbon with hydrogen in second answer.

Rohit 2019-05-02 23:04:35

Thanks