If $2.0 \ g$ of $NaOH$ is dissolved in $500 \ cm^{3}$ of water, what is the molarity of the solution?
- A$0.25 \ mol \ dm^{-3}$
- B$0.1 \ mol \ dm^{-3}$
- C$0.4 \ mol \ dm^{-3}$
- D$0.50 \ mol \ dm^{-3}$
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