$25 \ mL$ of $3.0 \ M \ HNO_3$ are mixed with $75 \ mL$ of $4.0 \ M \ HNO_3$. If the volumes are additive,the molarity of the final mixture would be $......... \ M$.
- A$3.25$
- B$4.0$
- C$3.75$
- D$3.50$
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