$\mathrm{M}_ 1=98 \times 1.80 \times 10 / 98=18$
Now from formula, $\mathrm{M_1V}_1=\mathrm{M}_ 2 \mathrm V_ 2$
$\mathrm{M}_1=18, \mathrm{V}_1=?, \mathrm{M}_2=0.1, \mathrm{V}_2=1 \mathrm{L}$
So, $\mathrm{V}_1=\mathrm{M}_2 \mathrm{V}_2 / \mathrm{M}_1$
$\mathrm{V}_1=0.1 \times 1 / 18=0.0055\;litters = 5.55\;ml$