A different brand of iron tablet was analysed by titration with 0.0093 mol. L-1 potassium dichromate via the reaction listed below; Cr2O72- + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O
In this experiment 4 tablets were crushed and dissolved in 200 cm3 of dilute acid. 25cm3 of this solution was used in the titration. The results of the titrations were as follows;

Titration
Volume dichromate (cm3)
1
33.0
2
32.05
3
32.15
4
32.10

Calculate the concentration of iron used in the titration (4 dp).

Calculate the number of moles in the original iron solution (200 cm3) (5 dp)

Calculate the mass of iron in the solution (grams, 4 dp).

Calculate the mass of iron each tablet (miligrams, 1 dp)

c most likely

hop this let me know if it is wrong

h let me think

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).