1. Calculate the molarity and normality of each of the compounds:
1. H3PO4 at 85% m / m and specific gravity of 1.689 g / mL.
2. NH3 at 28% m / m and specific gravity of 0.898 g / mL.

2. Prepare 500 mL of a 0.1 M solution from a concentrated HCl solution (37% m / m, density 1.19 g / mL).