Match the following prefixes with their multiples:

Prefixes	Multiples
$i$. micro	$10^{6}$
$ii$. deca	$10^{9}$
$iii$. mega	$10^{-6}$
$iv$. giga	$10^{-15}$
$v$. femto	$10$

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 ........

How many significant figures should be present in the answer of the following calculation? $\frac{2.5 \times 1.25 \times 3.5}{2.01}$

The triple point of water is $................$ $K$. (in $.16$)

$4 \ L \ atm$ is equal to (in $cal$)

$1 \, amu = ........ \, mg.$