250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl . The number of unreacted HCl molecules in the solution after complete reaction is $\_\_\_\_$ $\times 10^{21}$.
(Nearest integer)
$\left(\mathrm{NA}=6.022 \times 10^{23}\right)$
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