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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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