25 mL of 2.5 m HNO₃ contains enough nitric acid to dissolve an old copper penny with a mass of 3.94 g
Molarity is a measure of the concentration of a chemical species, especially a solute, in solution and is expressed as the amount of substance per unit volume of solution. The most commonly used unit of molarity in chemistry is moles per liter in SI units using the unit symbols mol/L or mol/dm³.
For the given case,
Molar mass HNO₃ = 63.0 g/mol
Number of moles = 3.94 / 63.0
= 0.0625 moles
Volume = moles / molarity
V = 0.0625 / 2.5
V = 0.025 x 1000
= 25 mL
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