We have to form $0.01$ mole salt.

So $0.01$ mole nitrobenzene is required.

$0.03$ mole $Sn$ is required.

So the amount of nitrobenzene $=0.01 \times 123=1.23 gm$ the amount of Sn required $=0.01 \times 357=3.57 gm$

($2$) The value of $y$ is So to get $1.29 gm$ organic salt.

We have to form $0.01$ mole salt.

So $0.01$ mole nitrobenzene is required.

$0.03$ mole $Sn$ is required.

So the amount of nitrobenzene $=0.01 \times 123=1.23 gm$ the amount of $S n$ required $=0.01 \times 357=3.57 gm$