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Calculate the molecular mass of the following in u. 

a. NH3 

b. CH3COOH 

c. C2H5OH

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(a) Molecular mass of NH3 = (1 × Average atomic mass of N) + (3 × Average atomic mass of H)

= (1 × 14.0 u) +(3 × 1.0 u)

= 17 u

(b) Molecular mass of CH3COOH = (2 × Average atomic mass of C) + (4 × Average atomic mass of H) + (2 × Average atomic mass of O)

= (2 × 12.0 u) + (4 × 1.0 u) + (2 × 16.0 u) 

= 60 u

(c). Molecular mass of C2H5OH = (2 × Average atomic mass of C) + (6 × Average atomic mass of H) + (1 × Average atomic mass of O) 

= (2 × 12.0 u) + (6 × 1.0 u) + (1 × 16.0 u) 

= 46 u

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