Fill in the blanks given below:
$(i)$ The instrument used to measure the mass of a single atom is .......
$(ii)$ The sum of the mole fractions of all components in a solution is always .......
$(iii)$ The $SI$ unit of volume is ........

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(N/A) $(i)$ Mass spectrometer
$(ii)$ $1$
$(iii)$ $m^3$

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