Question:
AP Chemistry mass % help plz?
Here‘s the question:An iron ore sample contains Fe2O3 plus other impurities. A 752-g sample of impure iron ore is heated with excess carbon, producing 453 g of pure iron by the following reaction:Fe2O3(s) + 3C(s) --gt; 2Fe(s) + 3CO(g)What is the mass percent of Fe2O3 in the impure iron ore sample? Assume that Fe2O3 is the only source of iron and that the reaction is 100% efficient. The answer at the back of the book says 86.2% but I do not know how they got that. Can anyone show me the steps to get to the answer please. Thanks!
Answer:
2 x 10^36 kg cases (one thousand g / kg) 2 x 10^39 g 7 x 10^5 km cases (10^5 cm/km) 7 x 10^10 cm quantity of action picture star quantity of a sphere (4/3)?r^3 (you're able to try this one) Then: mass divided by making use of quantity density
Pet stores. Do not try to select and clean found rocks for aquaria. The cleaning and solubility testing requires skill and patience. Limestone containing rocks will slowly dissolve and drastically alter pH. Proper cleaning is a very long drawn out process. Even rocks from landscape sources can be contaminated with weed killers or insecticides. It will cost a little extra, but it will be correctly cleaned.
Nope.Gravel rocks are not undesirable and it may be good while you're utilising your aquarium for turtles you are able to blend gravel rocks with those black pebbles or you ought to purchase some vivid colored pebbles from the puppy save which needless to say does no longer reason harm on your pets. you are able to upload somewhat soil with the rocks to boost the reality of it yet once you do no longer in straightforward terms like the belief, then do no longer decide for it.
2 x 10^36 kg cases (one thousand g / kg) 2 x 10^39 g 7 x 10^5 km cases (10^5 cm/km) 7 x 10^10 cm quantity of action picture star quantity of a sphere (4/3)?r^3 (you're able to try this one) Then: mass divided by making use of quantity density
What you need to use is stoichiometry, the molar mass of Fe, and the molar mass of Fe2O3. First, find the number of moles of pure iron molar mass of Fe 55.847 g/mol So, 453g/55.847 g 8.111 mol Now we use stoichiometry to find the true amount of Fe2O3 in the impure sample. It takes 2 moles of Fe for every one of Fe2O3, so the number of moles is 8.111mol / 2 4.056 mol of Fe2O3. Now change from moles to grams. molar mass of Fe2O3 159.692 g/mol 4.056g * 159.692 g/mol 647.631 g Fe2O3. Now divide the true amount by the impure amount for mass percent of the Fe2O3. 647.631 g / 752 g 86.221% And there you have it! Best of luck!
Fe2O3(s) + 3C(s) -- 2Fe(s) + 3CO(g) First, you must find the number of moles of Fe on the right side of the equation: [Mass / Molar Mass # of Moles] 453g / 55.8g/mol 8.118moles of Fe Using the molar ratio, you can find the number of moles of Fe2O3 you have. You find that: [2 Moles of Fe per 1 Mole of Fe2O3] 8.118mol / 2 4.05913moles of Fe2O3 Finding the actual mass of Fe2O3: [Moles x Molar Mass Mass] 4.05913mol x (55.8 x 2 + 16 x 3)mol/g 647.8 grams of Fe2O3 This means that of the 752-g of Impure Iron Ore, 647.8-g is pure Iron Oxide. [Pure Mass / Total Mass Percent Purity] 647.8g / 752g 86.1% 647.8g / 752g
Pet stores. Do not try to select and clean found rocks for aquaria. The cleaning and solubility testing requires skill and patience. Limestone containing rocks will slowly dissolve and drastically alter pH. Proper cleaning is a very long drawn out process. Even rocks from landscape sources can be contaminated with weed killers or insecticides. It will cost a little extra, but it will be correctly cleaned.
Nope.Gravel rocks are not undesirable and it may be good while you're utilising your aquarium for turtles you are able to blend gravel rocks with those black pebbles or you ought to purchase some vivid colored pebbles from the puppy save which needless to say does no longer reason harm on your pets. you are able to upload somewhat soil with the rocks to boost the reality of it yet once you do no longer in straightforward terms like the belief, then do no longer decide for it.
What you need to use is stoichiometry, the molar mass of Fe, and the molar mass of Fe2O3. First, find the number of moles of pure iron molar mass of Fe 55.847 g/mol So, 453g/55.847 g 8.111 mol Now we use stoichiometry to find the true amount of Fe2O3 in the impure sample. It takes 2 moles of Fe for every one of Fe2O3, so the number of moles is 8.111mol / 2 4.056 mol of Fe2O3. Now change from moles to grams. molar mass of Fe2O3 159.692 g/mol 4.056g * 159.692 g/mol 647.631 g Fe2O3. Now divide the true amount by the impure amount for mass percent of the Fe2O3. 647.631 g / 752 g 86.221% And there you have it! Best of luck!
