It is necessary to develop alternative sources of energy because. scientists are uncertain of how long the resources will last.
scientists are certain of how long the resources will last.
only a select group of people have information on our resources.
scientists have estimated how long the resources will last.

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.

particle   p is an electron and particle q is a neutron

it's 3.2 on edge, i just took the test.