What’s the oxidation number for Na2SO4

Explanation:

a2SO4 has two sodium (Na) atoms with an oxidation charge of plus 1 each and an overall oxidation value of plus 2. Add together the oxidation values for all known species. Subtract the summed value from the overall charge of the compound. For example, Na2SO4, Na2 yields 2 (plus 1) + 4(minus 2) = minus 6.

One Sodium (+1) and one sulfate (-2)

Explanation:

Na2(+1) = 21 = 2

SO4(-2) = 1-2 =-2.

It means stable

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.