Why is magnesium 2.5m powder of HNO3 faster than magnessium 2.5m strip of HNO3?

The reaction rate of magnesium powder in 2.5 M HNO3 is faster than that of magnesium strips due to the increased surface area of the powder. Finer particles expose more surface area to the acid, allowing for more collisions between reactants and facilitating a quicker reaction. In contrast, the larger surface area of the magnesium strip limits the number of reactive sites available for the acid to interact with, resulting in a slower reaction rate.