Four different food colourings are analysed using chromatography. The results are shown on the chromatogram. The diagram is not drawn to scale.
Which food colouring contains a component with an R value of 0.3?
solvent front
10 cm
8cm-
0
6cm-
0
0
Acm
0
2 cm
0
0
baseline
9
B

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.