When 78.6 g of urea ch4n2o are dissolved in 700. g of a certain mystery liquid x, the freezing point of the solution is 4.9 °c lower than the freezing point of pure x. on the other hand, when 78.6 g of sodium chloride are dissolved in the same mass of x, the freezing point of the solution is 8.5°c lower than the freezing point of pure x. calculate the van't hoff factor for sodium chloride in x. be sure your answer has a unit symbol, if necessary, and round your answer to 2 significant digits.

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 believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

i believe it is a.) released into

explanation: