\( 0.01 \) moles of a weak acid \( \mathrm{HA} (K_a = 2.0 \times 10^{-6}) \) is dissolved in \( 1.0 \, \text{L} \) of \( 0.1 \, \text{M} \) \( \mathrm{HCl} \) solution. The degree of dissociation of \( \mathrm{HA} \) is ______ \( \times 10^{-5} \) (Round off to the Nearest Integer) [Assume degree of dissociation \( \ll 1 \)]
