Alaser light was shone through a diffraction grating whose lines were 1/1000 mm apart. the distance was measured between the center spot and the first side spot and found to be 99 mm. the distance from the dif‐ fraction grating to the first side spot was found to be 154 mm. calculate the wavelength of light in nm that the laser pointer was emitting

answer; /// i do believe that the correct answer is (c)nuclear bond

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.