Use the method of successive approximations to determine the pH and concentrations of H 2 A , HA − , and A 2 − in a solution of 2.00 × 10 − 3 M monopotassium fumarate ( KHA ). The p K a values for fumaric acid are 3.02 ( p K a1 ) and 4.48 ( p K a2 ).

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

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.

i'm assuming that the correct answer is indeed the first one/ "a"..