Answer to Question #229421 in General Chemistry for Kumi

Question

How many grams of HNO3 are in 75ml of a 8.0m HNO3 solution

Answer 1

There should be an assumption that 8.0 m refers to the molaRity, not molaLity as the mass in this case could not be calculated with only given data (the density of the solution is required). However, using the molarity it can be found. The molar mass of HNO₃ is 63.01 g/mol.

$m(HNO_3)=0.075L\times\frac{8.0mol(HNO_3)}{1L}\times\frac{63.01g}{1mol(HNO_3)}=38.g$

Answer: 38. g