Under what circumstances is isolation necessary when dealing with hazardous material events?

When the material is explosive, oxidizing, poisonous, radioactive, corrosive, biohazard material.

Explanation:

If the material is explosive, precautions must be high, and insulation serves to prevent explosion.

If the material is oxidizing or corrosive, the insulation serves to prevent spillage and damage to the structure.

If the material is poisonous, radioactive or biohazard, it must be insulated to prevent damage to the environment, structures, and nearby personnel operating it.

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number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.