Question

Calculate the molecular masses of C2H4

NCERT Class IX
Sciences - Main Course Book

Chapter 3. Atoms and Molecules

Answer 1

Molecular mass of C2H4 = 2*(Molecular mass of carbon) +                                                                           4*(Molecular mass of hydrogen) 
   
                                      = 2*12 +4*1
 
                                      = 24 + 4
                       
                                      = 28  
 
                                      

Answer 2

Answer:

Explanation:Write the Chemical formula of Ethyne (C2H2):

Then write Mass of Carbon = 12 grams

Then write Mass of Hydrogen = 1 grams

Molar mass of Ethyne =

= (mass of Carbon * number of Carbon atoms) + (mass of Hydrogen * number of Hydrogen atoms)

= (12*2) + (2*1)

= 24+ 2

= 26 grams