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Q.

What is the molecular mass of ethane (C2 H6)?

(Atomic mass of carbon is 12 and the atomic mass of  hydrogen is 1)

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a

32u

b

40u

c

30u

d

25u

answer is C.

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Detailed Solution

 Carbon has an individual mass of 12 u, while hydrogen has a mass of 1 u. 

   C2 H6 is the chemical formula for ethane.

 Molecular mass of ethane 

= 2 X atomic mass of Carbon + 6 X atomic mass of hydrogen  

=2X 12 +  6 X 1

=   24+6 

= 30 u

 The molecular mass of ethane is 30 u.                                                   

                                         

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What is the molecular mass of ethane (C2 H6)?(Atomic mass of carbon is 12 and the atomic mass of  hydrogen is 1)