If 83.0 ml of 0.150 m hcl(aq) is needed to neutralize all the nh3(g) from a 2.25-g sample of organic material, calculate the mass percentage of nitrogen in the sample.

7.75% nitrogen in the sample. The balanced reaction of HCl and NH3 is HCl + NH3 = NH4Cl Which means that 1 mole of HCl will neutralize 1 mole of HN3. Since we used 83.0 ml of 0.150 m HCl, that means that we used 0.083 l * 0.150 mol/l = 0.01245 mol So we had 0.01245 mol of NH3 which means that we had 0.01245 mol of N Looking up the atomic weight of nitrogen, we get 14.0067. So 0.01245 * 14.0067 = 0.174383415 g We now know that the sample had 0.17438 g of nitrogen. Divide by the original mass of the sample, getting 0.17438 / 2.25 = 0.077502222 = 7.7502222% Rounding the result to 3 significant figures, gives us a mass percentage of 7.75% nitrogen in the original sample.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.