Question

1. how many $r_f$ values should you calculate for sample c? you should calculate 1 $r_f$ value by measuring to the middle of the two spots on the chromatograph. you should calculate 1 $r_f$ value for sample c by averaging the $r_f$ values for the two spots on the chromatography. you should calculate 2 $r_f$ values, one value for each spot visible on the chromatograph.

Explanation:

In chromatography, each distinct spot represents a different component. The \(R_f\) (retention factor) value is calculated for each component separately. Since Sample C has two visible spots, each spot corresponds to a different component. Thus, we calculate an \(R_f\) value for each spot.

Answer:

You should calculate 2 \(R_f\) values, one value for each spot visible on the chromatograph.