What is the total mass (in grams) of 1.000 l of an aqueous 1.500 m nacl solution with a density of 1.058 g/ml? (do not include the unit in your answer)?

The density is an unique property of a compound in solid or liquid phase. The density is the mass of the compound in its unit volume. Now due to the addition of an particular amount of solid like in this case salt  (NaCl) the density of the water will change and the density given will be the density of the salted water.

The volume of the salted water is 1L or 1000mL. The density of the salted water is 1.058g/mL. Thus the 1 mL of the solution have the mass 1.058 g. Thus 1000 mL of the solution will have mass 1058.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.