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2. Answer the following questions .

D. Calculate the molecular mass of the following in u.

a. NH3 b. CH3 COOH c. C2H5OH

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A)  NH

molecular mass of NH3 =(1\(\times atomic \space mass \space of \space N\) )  +\((3\times\) atomic mass of H) 

\(=(1\times14 u)+(3\times 1u)\)

=17 u 

B) CHCOOH 

molecular mass of  CHCOOH  =\((2\times atomic \space mass \space of \space C)\) + (2\(\times atomic \space mass \space of \space O\) ) +(4\(\times atomic \space mass \space of \space H\) )

=\((2\times 12u)+(2\times 16u)+(4\times 1u)\) 

=60 u

C) C2H5OH

molecular mass of C2H5OH = \((2\times atomic \space mass \space of \space C)+(6\times atomic \space mass \space of \space H)+(1\times atomic \space mass \space of \space O)\) 

=\((2\times 12u)+(6\times 1u)+(1\times 16u)\)

=46 u

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