A sample of an iron ore is dissolved in acid, and the iron is converted to Fe^2. The sample is then titrated with 47.20 ml of 0.02240 M MnO_4 solution. The oxidation-reduction reaction that occured during titration is as follows:MnO_4(aq) + 5Fe^2(aq) + 8H^+(aq) -----gt; Mn^2(aq) + 5Fe^3(aq) + 4H_2O(l)a. How Many moles of MnO_4 were added to the solution ?b. How many moles of Fe^2 were in the sample ?c. How many grams of iron were in the sample ?d. If the sample had a mass of 0.8890 g, what is the percentage of iron in the sample ?
Commercial planes all use hydraulics to operate the brakes. A Parking brake on a commercial airliner only blocks the return line of the hydraulic brakes therefore not allowing them to release. If you have no pressure in the line to set the brake in the first place the parking brake is worthless.
i dont think it is possible because using the parking brake when landing causes damage to the aircraft. Using just reverse thrust and speedbrakes/spoilers (the flaps on top of the wing that deflect airflow) i have trieed on my flight simulator and the only place i could stop safely was the 15,000 foot Shuttle Landing Facility, at Kennedy Space Centre in Flordia. but then again, it is a simulation game, it might not happen in real life. and yes the parking brake is set at the gate all the time no matter if they use wheel chocks or not
can anyone tell me what is the correct answer for this question?
a. Molarity and ml converted to L cancel out to give you moles 0.02240 mol/L x 0.04720L 0.001057 mol MnO4 b. use the balanced equation to convert from moles of MnO4 to moles of Fe^2 0.001057 mol MnO4 x (5 mol Fe^2 / 1mol MnO4) 0.005285 mol Fe^2 c. now, just convert from mol of Fe^2 to grams using molar massthe mass of Fe alone is 55.8452 g/mol but you have 2 of them so now it's 111.6904 g/mol. 0.005285 mol Fe^2 x (111.6904 g/mol /1 mol Fe^2) 0.5903 g of Fe^2 d. now that you know how many grams of iron there are you can see how much of the whole sample is made up on iron by dividing iron by the mass of the whole sample. (0.5903 g of Fe^2 / 0.8890 g) x 100% 66.40 % of the sample is iron. please let me know if you need further help or clarification. 3 Dee
I don't have a general knowledge of all airplanes but I would say NO. My experience on a Cessna 172 is the brakes are broken the parking brake is not going to work.
I don't have a general knowledge of all airplanes but I would say NO. My experience on a Cessna 172 is the brakes are broken the parking brake is not going to work.
Commercial planes all use hydraulics to operate the brakes. A Parking brake on a commercial airliner only blocks the return line of the hydraulic brakes therefore not allowing them to release. If you have no pressure in the line to set the brake in the first place the parking brake is worthless.
i dont think it is possible because using the parking brake when landing causes damage to the aircraft. Using just reverse thrust and speedbrakes/spoilers (the flaps on top of the wing that deflect airflow) i have trieed on my flight simulator and the only place i could stop safely was the 15,000 foot Shuttle Landing Facility, at Kennedy Space Centre in Flordia. but then again, it is a simulation game, it might not happen in real life. and yes the parking brake is set at the gate all the time no matter if they use wheel chocks or not
can anyone tell me what is the correct answer for this question?
a. Molarity and ml converted to L cancel out to give you moles 0.02240 mol/L x 0.04720L 0.001057 mol MnO4 b. use the balanced equation to convert from moles of MnO4 to moles of Fe^2 0.001057 mol MnO4 x (5 mol Fe^2 / 1mol MnO4) 0.005285 mol Fe^2 c. now, just convert from mol of Fe^2 to grams using molar massthe mass of Fe alone is 55.8452 g/mol but you have 2 of them so now it's 111.6904 g/mol. 0.005285 mol Fe^2 x (111.6904 g/mol /1 mol Fe^2) 0.5903 g of Fe^2 d. now that you know how many grams of iron there are you can see how much of the whole sample is made up on iron by dividing iron by the mass of the whole sample. (0.5903 g of Fe^2 / 0.8890 g) x 100% 66.40 % of the sample is iron. please let me know if you need further help or clarification. 3 Dee
