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250 mL of 0.5 M NaOH was added to 500 mL...

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 _______ `xx 10^(21)`.
(Nearest integer)
`(N_A = 6.022 xx 10^(23))`

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