# Chemistry

Magnetite, an iron ore with formula Fe3O4, can be reduced by treatment with hydrogen to yield iron metal and water vapor.
(a) Write the balanced equation. (Use the lowest possible coefficients.)
1Fe3O4(s) + 4H2(g)-> 3Fe(s) + 4H2O(g)

(b) This process requires 36 kcal for every 1.00 mol of Fe3O4 reduced. How much energy (in kilocalories) is required to produce 63 g of iron?
. kcal

(c) How many grams of hydrogen are needed to produce 69 g of iron?
. g

1. 👍 0
2. 👎 0
3. 👁 2,013
1. 36 kcal for 3 mols Fe or 12 kcal for 1 mol Fe = 55.85 g Fe.
12 kcal x (63/55.85) = ? kcal

1. 👍 0
2. 👎 0
2. Magnetite, an iron ore with formula Fe3O4, can be reduced by treatment with hydrogen to yield iron metal and water vapor.
(a) Write the balanced equation. (Use the lowest possible coefficients.)
1Fe3O4(s) + 4H2(g)-> 3Fe(s) + 4H2O(g)

How many grams of hydrogen are needed to produce 81g of iron?

1. 👍 0
2. 👎 0
3. b)

Find the molecular weight of Fe3 which is 167.535
Then divide the 63g of iron by the molecular weight (167.535) and you get 0.376.
Then you multiply 0.376 by the 36 kcal to get your answer of 13.536 or rounded to 14.

1. 👍 1
2. 👎 0
4. whatis formula iron ore dencity

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chimestry

(Iron ore is impure Fe_2O_3. When Fe_2O_3 is heated with an excess of carbon (coke), metallic iron and carbon monoxide gas are produced. From a sample of ore weighing 950kg , 533kg of pure iron is obtained). What is the mass

2. ### Chemistry

Iron reacts with steam according to the reaction 3Fe +4 H2O → Fe3O4 + 4H2O. How many grams of iron will react with 5 moles of steam to convert to iron oxide with 100% product yield? a. 72g b. 90g c. 168g d. 210g****

3. ### Chemistry

1.630 g of iron ore is dissolved in an acidic solution. This solution is titrated to a pink endpoint with 27.15 mL of a 0.020 M KMnO4 solution. a. How many moles of MnO4- ions were consumed? b. How many moles of Fe2+ were in the

4. ### science

Are rocks considered valuable natural resources?(1 point) No, rocks are not valuable because they contain a lot of waste. No, rocks are not valuable because they are nonliving solids. Yes, rocks are valuable because they are

1. ### Chemistry

Calculate the percent yield of iron if 950 g of Fe3O4 underwent the reaction shown in the chemical equation below and 533 g of Fe was isolated from the reaction mixture. Fe3O4 (s) + 2 C(s) ----> 2 CO2 (g) + 3 Fe(s) 1). 25.9% 2).

2. ### Chemistry

A sample of 1.55g of iron ore is dissolved in a acid solution in which the iron is converted into Fe2+. The solution formed is then titrated with KMnO4 which oxidises Fe2+ to Fe3+ while the MnO4- ions are reduced to Mn2+ ions.

3. ### Heat of Formation

When 10.00 g of iron is burned in O2(g)to form Fe3O4 (s) , enough heat is generated to raise the temperature of 784 g of water from 18.0 C to 38.0 C. Calculate the heat of formation of Fe3O4 (s) under these conditions in kJ/mol.

4. ### linear programming

Exeter Mines produces iron ore at four different mines; however, the ores extracted at each mine are different in their iron content. Mine 1 produces magnetite ore, which has a 70% iron content; mine 2 produces limonite ore, which

1. ### chemistry

a chemist reacts 8.85g or iron with an excess oh hydrogen chloride to form hydrogen gas and iron(II)chloride.calculate the theoretical yield and the percentage yield of hydrogen if 0.27g H2 are collected

2. ### Chem problem- percent yield

Heating an ore of antimony (Sb2S3) in the presence of iron gives the element antimony and iron(II) sulfide. Sb2S3 (s) + 3Fe(s) ¨ 2Sb(s) + 3FeS(s) When 15.0 g Sb2S3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the

3. ### chemistry

a sample iron ore is dissolved in an acidic solution in which yhe iron is converted into fe2+. the solution formed the titrated with kmno4 which oxidies fe2+ to fe3+ while kmno- ions are reduced to mn2+. 92.95 ml of 0..02M of

4. ### Chemistry

Iron ores have different amounts of iron per kilogram of ore. Calculate the mass percent composition of iron for each iron ore: Fe2O3{\rm Fe_2O_3} (hematite), Fe3O4{\rm Fe_3O_4} (magnetite), FeCO3{\rm FeCO_3} (siderite).