An element x forms an iodide (xi3­) and a chloride (xcl3). the iodide is completely converted to the chloride when it is heated in a stream of chlorine: 2xi3 3 cl2 → 2xcl3 3i2. if 0.5000 g of xi3 is treated, 0.1635 g of xcl3 is obtained. identify the element x (write down the atomic symbol for x).

ᗩᑎᔕᗯeᖇ: b is the answer

> b

tꫝꪖꪀk ꪗꪮꪊ ᠻꪮ ꪖડkⅈꪀᧁ!

cꪮꪀⅈꪀꪊꫀ ꪮꪀ ꪶꫀꪖꪀⅈꪀᧁ

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 think it's c. i'm not sure but i think so.