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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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