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C. The mass of an atom of hydrogen is 1.008 u. What is the mass of 18 atoms of hydrogen.

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Given :  mass of hydrogen = 1.008 u

To find : mass of 18 atoms of hydrogen

Solution :

mass of 18 atoms of hydrogen = 18 $$\times$$ mass of hydrogen

=$$18\times 1.008 u=18.144u$$

$$\therefore$$ mass of 18 atoms of hydrogen is 18.144 u

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