Answer:
5.4 cm
Explanation:
The Rf value can be calculated using the formula
Rf = A/B
Where A is the distance travelled by the compound, and B is the distance traveled by the solvent. If the compound and the developing solvent remain the same, the Rf value does not change, no matter the dimensions of the plate or how long the solvent was allowed to travel.
As such, we're left with Rf = 0.48 and B = 11.3 cm, so now we solve for A:
0.48 = A / 11.3
A = 5.4 cm
