Question

a 50.0 ml sample of a 15% (m/v) solution of H2SO4 is added to water to give a final volume of 250.0 ml. What would the final concentration be?
I assume the subject is chemistry. Just trying to help you get answers more quickly. :-)
Quantity of H2SO4 did not change, the volume is increased by a factor of 5.

The concentration is therefore
15%/5=3% (m/v) assuming the volumes are measured at the same temperature.

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