Question

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.
Ncert solutions for Class 11th Chemistry Part - 1 Chapter 1 Exercise 9

Answer 1

1 molecule of ethane contains 2 carbon atoms 
so 3 moles of ethane contains 6 mole of carbon atoms.
1 molecule of ethane contains 6 hydrogen atoms 
so 3 moles of ethane contains 18 mole of hydrogen atoms.
1 mole of ethane contains 6.023×10²³ molecules of ethane
so 3 mole of ethane contains 3×6.023×10²³ =18.069 ×10²³ molecules of ethane

Answer 2

Answer:

In 3 moles of ethane, we have 2 moles of Carbon, 18 moles of Hydrogen, and 18.066x10²³ molecules of ethane.

Explanation:

From the structural formula of Ethane ($C_2H_6$), we can understand the following -

1. There are 2 atoms of carbon in 1 ethane molecule. Thus, in 3 moles of ethane, there are 6 moles of carbon atoms.

2. There are 6 hydrogen atoms in 1 ethane molecule. So, we can conclude that there will be 18 moles of hydrogen atoms in 3 moles of ethane.

3. According to the mole theory, in 1 mole, there are Avogadro's number of molecules ($6.022 \times 10^2^3$).
Thus, in 3 moles, there would be $3 \times (6.022\times10^2^3) = 18.066\times10^2^3$ molecules of ethane.

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