Consider the reaction

$4{\mathrm{HNO}}_3\left(\mathrm{l}\right)+3\mathrm{KCl}\left(\mathrm{s}\right)\to {\mathrm{Cl}}_2\left(\mathrm{g}\right)+\mathrm{NOCl}\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)+3{\mathrm{KNO}}_3\left(\mathrm{s}\right)$

The amount of ${\mathrm{HNO}}_3$ required to produce$110.0 \mathrm{g}$ of ${\mathrm{KNO}}_3$ is

(Given : Atomic masses of $\mathrm{H},\mathrm{O},\mathrm{N}$ and $\mathrm{K}$ are $1,16,14$ and $39$, respectively.)

Uracil is base present in $\mathrm{RNA}$  with the following structure. $\% \mathrm{of} \mathrm{N}$ in uracil is _______.

The number of units, which are used to express concentration of solutions from the following is _________.

(Mass percent, Mole, Mole fraction, Molarity, ppm, Molality.)

In sulphur estimation. $0.471 \mathrm{g}$ of an organic compound gave $1.4439 \mathrm{g}$ of barium sulphate. The percentage of sulphur in the compound is _______(Nearest Integer)

(Given: Atomic mass Ba: $137\mathrm{u}:\mathrm{S}:32\mathrm{u},\mathrm{O}:16\mathrm{u}$ )