Explain why there is glucose ni urine

This could be because someone has Glycosuria. Glycosuria is what happens when your kidneys can not take out enough sugar from your blood vessels and in turn passes it through urination. This is usually not a good thing to have as it could tell you that your kidneys do not function as good as they should. This is something that is not dangerous to your life, but does need to be looked at because it tells you that your kidneys are weaker than they should be and might lead to other complications later in life.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.