You are given a sample of several compounds to separate by paper chromatography. You draw a pencil line exactly 1.00 cm from the bottom of the paper, and place a spot of sample on it. You dry the sample, then develop it in a solvent. When the chromatogram is taken out of the solvent, the paper is wet up to 9.17 cm from the bottom of the sheet. The compound you are interested in shows up as a spot 7.57 cm from the bottom of the paper. Calculate the following: a. How far did the compound move?
b. In the same time, how far did the solvent move?
c. What is the Rf factor for the compound?

a. 6.57 cm

b. 8.17 cm

c. 0.80

Explanation:

a. The compound moved from where it was first placed, to a spot 7.57 cm from the bottom of the paper, in other words:

b. A similar method is made for the solvent:

c. The Rf of the factor is equal to the distance that the compound moved divided by the distance the solvent moved:

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3