<p>How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>? The concentrated acid is 70% by mass&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math></p>