reactant after 30 minutes is \( 0.05 \) mole \( \mathrm{dm}^{-3} \)...
reactant after 30 minutes is \( 0.05 \) mole \( \mathrm{dm}^{-3} \), then its initial concentration would be
(A) \( 0.01 \) mole \( \mathrm{dm}^{-3} \)
(B) \( 0.15 \mathrm{~mole} \mathrm{dm}^{-3} \)
(C) \( 0.25 \) mole \( \mathrm{dm}^{-3} \)
(D) \( 4.00 \) mole \( \mathrm{dm}^{-3} \)
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