Answer to Question #143449 in General Chemistry for yara

Question

What is the molar concentration of a solution of 63.0g HNO3 in 0.25 L of H2O?

Answer 1

Solution:

Molar concentration (С) is calculated by dividing the moles of solute (n) by the total volume (V) of the:

С = n/V

We must convert the mass of HNO₃ in grams into moles. We do this by dividing by the molecular weight of HNO₃ (63,01 gram/mol).

n = 63,0 gram HNO₃ / 63.01 gram/mol = 1.0 mol HNO₃

Then, we divide the number of moles by the solution volume to get concentration.

C = 1.0 mol / 0.25 L = 4.0 M

Answer: the molarity of a solution HNO₃ is 4.0 M.