Question

A. How many liters of H2S gas could be generated at STP from the reaction of dilute HCl with 15.55 kg of an ore that is 15.7 % iron(II) sulfide by mass?

C. A mass of 0.3976 gof ore was dissolved in I−(aq). The resulting solution required 17.98 mLof 0.01043 MNa2S2O3for complete titration. What is the percentage of copper in the ore? Express your answer to four significant figures and include the appropriate units.

Use and preparation of hydrogen sulfide Hydrogen sulfide, H2S, is often used as a qualitative tool to detect and separate metal ions by formation of sulfide precipitates. H2S can be generated from metal sulfides by reaction with dilute acids. Part A How many liters of H2S gas could be generated at STP from the reaction of dilute HCl with 15.55 kg of an ore that is 15.7 % iron(II) sulfide by mass? Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) ': MÅ R o 2 ? Value Units

Answer 1

Date poed fel. +Hd H₂ st n = 2 YET € 2.447X1000 equating the mass of fes = 15.7 - *-15ss - = 2.44119 moles of fes, & = 20.341 moles. .. 2 x 20.341 = 1x equivalents of TASE 40.682 moles H₂S and teda A Pr=nRT 1x V= 40.682X 0.0821*273 v= 911.817 litres no - = 2 ® Cut2 + I” Car In + In Q, . ue mole of Cuts ex males of I, perducediy II, + Nase na Na, by 08+ Ba Nai equations ♡ dx mols of I2 = 1x moles of Naz O3 from equations 1 and @ we get i ke IX moles of Cut² = 1X moles of Narfels TA moles of Cut? = 17.98 x 0.01043 I miles of Cut? = 0.000 1875 moles o mass of Cut² = 0.0001875 X 63.5 mass = 0.0119 grams 0.0119 0.3975 = . 2.9929 *100 =