A galvanic cell is composed of these two half cells, with the standard reduction potentials shown CO2+(aq) + 2 e‑ º Co(s) ‑0.28 volt
Cr3+(aq) + 3 e‑ º Cr(s) ‑0.74 volt
The actual Co2+(aq) concentration is 0.00100 M, while the Cr3+(aq) concentration is unknown.
The actual cell potential Ecell measured 0.38 volts. What is the actual concentration of the Cr3+ ion
in the cell?
a. 0.00180 M
b. 0.00500 M
c. 0.0090 M
d. 0.0360 M
e. 0.360 M

Compare and contrast refraction of light and sound will give brainliest

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.